It remains a question_______we can finish the project in such a short time.
A．whatB．thatC．how D．when
C

試題分析：句意：我們?nèi)绾卧谶@么短的時(shí)間完成這項(xiàng)任務(wù)仍然是一個(gè)問題。這里是it是形式主語，how引導(dǎo)的真正的主語從句，它在句中作狀語。故選C。
點(diǎn)評：本題的難度適中。主語從句是高中階段的重難點(diǎn)之一，需要考生有分析理解復(fù)雜的句子結(jié)構(gòu)的能力，能夠正確理解句子的語境，熟練掌握連詞的意義及句法功能。這里考生容易誤選B。that在主語從句中不作成分。
即學(xué)即練：_______ 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為形式主語，代替真正的主語從句that Johnson had broken his promise ...；that引導(dǎo)同位語從句，解釋promise的具體內(nèi)容。
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