2. 外语
  3. Professor Johnson is said some significance ______advance in his research in the past year.

Professor Johnson is said some significance ______advance in his research in the past year.

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问题 Professor Johnson is said some significance ______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 用不定式的完成体形式表示过去意义。
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