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【题目】_____ people have done lots of research on moon, there is still much waiting to be discovered.

A. If B. Since C. Because D. Though

【答案】D

【解析】

句意:——尽管人们已经在月球上做了许多调查,还有很多有待发现的地方。A. If如果;B. Since自从;C. Because因为;D. Though尽管。根据下文there is still much waiting to be discovered可知上文是Though引导的让步状语从句。根据题意,故选D。

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