2. 外语
  3. Professor Johnson is said_______ some significant advance in his research in the past year.

Professor Johnson is said_______ some significant advance in his research in the past year.

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问题 Professor Johnson is said_______ some significant advance in his research in the past year.
选项 A、having made
B、making
C、to have made
D、to make
答案C
解析 is said后跟不定式，不能跟动词-ing形式，排除A和B。从句中的时间状语in the past year可以看出动作已经发生并完成。C项to have made是不定式的完成式，表示动作发生在谓语动词之前，而D项to make表示动作没有发生，故C项正确。
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