______ is quite difficult for Mary to pass the interview.

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问题 ______ is quite difficult for Mary to pass the interview.

选项 A、What
B、This
C、That
D、It

答案D

解析 it 可以用作先行词,作为句子主语,而把句子的真正主语移到后部去,以免主语显得过长。在这个句子中真正的主语是to pass the interview,it作形式主语。
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