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 题目和参考答案——青夏教育精英家教网—

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（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

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