When you point out the purpose / problem of research again, the（）is mainly used._精华吧

When you point out the purpose / problem of research again, the（）is mainly used.

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When you point out the purpose / problem of research again, the（）is mainly used.

A.present tense

B.present perfect tense

C.past tense

D.future tense

正确答案：past tense

Tag：学术英语写作时间：2022-01-18 13:04:53

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