Question

It remains a question_______we can finish the project in such a short time.

A．what

B．that

C．how

D．when

Answer 1

C

试题分析：句意：我们如何在这么短的时间完成这项任务仍然是一个问题。这里是it是形式主语，how引导的真正的主语从句，它在句中作状语。故选C。
点评：本题的难度适中。主语从句是高中阶段的重难点之一，需要考生有分析理解复杂的句子结构的能力，能够正确理解句子的语境，熟练掌握连词的意义及句法功能。这里考生容易误选B。that在主语从句中不作成分。
即学即练：_______ was known to us all that Johnson had broken his promise _______ he would give each of us a small gift.
A. As; which       B. What; that         C. It; that     D. It; which
解析：C。句意：It为形式主语，代替真正的主语从句that Johnson had broken his promise ...；that引导同位语从句，解释promise的具体内容。