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【题目】(2017·浙江温州· 6)________ the scientists have done lots of research on Mars,there is still much waiting to be discovered.

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

【答案】D

【解析】句意:虽然科学家已经对火星做了大量研究,但仍然有很多未解之谜等待揭晓。A. If如果; B. Since自从;C. Unless除非;D. Though虽然。根据题意,可知前后句关系是“虽然…但是…”,though/although不能和but同时出现,故答案为D。

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