Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.

A. it, it                    B. what, what

C. it, what               D. what, it

D


解析:

最佳答案是D，很容易誤選B，認(rèn)為兩空均考查形式主語。

第一空填形式主語，真正的主語是其后的不定式 to play with fire。第二空填 what，what is difficult 是主語從句，注意 what is difficult 后的謂語動詞 is。請做以下類似試題：

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