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【题目】______the scientists have done lots of research on Mars, there is still much waiting to be discovered.

A.IfB.SinceC.UnlessD.Though

【答案】D

【解析】

句意:尽管科学家们在火星上做了大量的研究,但仍有许多有待发现的地方。

A. If 如果;B. Since自从,既然;C. Unless除非;D. Though尽管。根据下文there is still much waiting to be discovered.可知这里是though引导的让步状语从句。根据题意,故选D

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