--How much do you know about the 3D film technology?

--A little. Not until ____the hot movie Avatar ____some about it.

A．did I see ,did I begin to learn               B．I saw, I began to learn

C．I saw, did I begin to learn                  D．did I see, I began to learn

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

During the first half of the nineteenth century in the United States, Christmas was a very different kind of holiday than it is today. There was no set of way of celebrating the day,which was not yet an official holiday.  71  Some observed Christmas as an important Christian religious day honoring the birth of Jesus.Others celebrated the day with parties,music,drinking and eating.   72    73  .Calvinist Christians banned the celebration of Christmas.But groups such as Episcopalians

and Moravians honored the day with religious services and seasonal decorations.

By mid-century,Christian groups began to ignore their religious diffrences over the meaning of Christmas and honored the day in special ways.

Christmas became an important time for families to celebrate at home. More and more Christians Americans also began to follow the European traditions of Christmas trees and giving gifts.Christians believed that the tree represented Jesus and was also a sign of new beginnings. German immigrants brought their tradion of putting lights,sweets and toys on the branches of evergreen trees placed in their homes.

This tradition of setting up a Christmas tree soon spread to many American homes.   74   As these traditions increased in popularity,the modern trade and business linked to Christmas also grew.

As Christmas became more popular,some states declared the day a state holiday.Louisiana was the first state to make the move in eighteen thirty-seven.  75   .It was not until eighteen seventy that President Ulysses Grant made Christmas a federal holiday.

A．So did the practice of giving people presents.

B. By eighteen sixty,fourteen other states had followed.

C. And,some communities did not celebrate the day at all.

D. Americans seldom gave each other presents on Christmas Day.

E. But many new American Christmas songs started to become popular.

F. Religion played a big role in how an American might celebrate the holiday.

G. Communities around the country honored the day in different ways.

Not until________,_________.

A. did she take off, I realized       B. she took off, did I realize

C. did she take off, did I realize    D. she took off, I realized

It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．

    A． when; which     B． when; that      C． that; which     D． that; that

Not until I began to work ________ how much time I had wasted.

A. didn’t I realize                              B. did I realize C. I didn’t realize                              D. I realize