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Do you know a lot of research work ＿＿ in recent years? A. have been carried out

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Do you know a lot of research work ＿＿ in recent years? A. have been carried out

Do you know a lot of research work ＿＿ in recent years?

     A. have been carried out      B. has carried out

     C. are carried out            D. has been carried out

试题答案

D

解析:

略

标签：researchofinworkyou

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