In "I think it impossible for man to live on the Mars", "it" is the ______ of th

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问题 In "I think it impossible for man to live on the Mars", "it" is the ______ of the sentence.

选项 A、real subject
B、real object
C、formal subject
D、formal object

答案 D

解析 it用法题。作宾语用的短语或从句之后有接宾语补足语时，必须将用作宾语的短语或从句放在补语之后，用it代替它原来的位置，这个it称为形式宾语。题中的it用来代替think的真正宾语to live on the Mars，故答案为D。

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