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【題目】______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:盡管科學家們在火星上做了大量的研究,但仍有許多有待發(fā)現(xiàn)的地方。

A. If 如果;B. Since自從,既然;C. Unless除非;D. Though盡管。根據下文there is still much waiting to be discovered.可知這里是though引導的讓步狀語從句。根據題意,故選D

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