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【题目】

The report aims to explain how these conclusions ______.

A. were reached

B. had been reached

C. have reached

D. had reached

【答案】A

【解析】这篇报告的目的是解释如何得出这些结论的。结论已经形成,因此使用一般过去时,conclusions 和reach之间是被动关系,因此用一般过去时的被动语态。故答案选A。

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