Professor Johnson is said some significance ______advance in his research in the

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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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A、Historians.B、Writersandpoets.C、Professorofmusic.D、ProfessorofEnglish.