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________, the compass was first invented in China．

It is known to all

It is known that

We all know

As is known to all

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He is a man of great experience, ________ much can be learned．

who

that

from which

from whom

选择最佳答案，完成非限制性定语从句

We are going to spend the Spring Festival in Guangzhou, ________ live my grandparents and some relatives．

which

that

who

where

选择最佳答案，完成非限制性定语从句

Carol said the work would be done by October, ________ personally I doubt very much．

it

that

when

which

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Some of the roads were flooded, ________ made our journey more difficult．

which

it

what

that