摘要： Is necessary to tell his father everything ? A. it B. that C. what D. he[答案与简析]选A.测试 it 用作形式主语.代替由不定式.动名词或从句表示的真正主语.又如:1)Is possible to fly to the moon in a spaceship ? A. now B. man C. that D. it2)Is necessary to complete the design before National Day ? A. this B. that C. he D. it3)Does matter if he can't finish the job on time ? A. this B. that C. he D. it4)It worried a bit her hair was turning grey . A. while B. that C. if D. for答案1) ― 4)DDDB.

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