【題目】(2017·浙江溫州· 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:雖然科學家已經(jīng)對火星做了大量研究,但仍然有很多未解之謎等待揭曉。A. If如果; B. Since自從;C. Unless除非;D. Though雖然。根據(jù)題意,可知前后句關(guān)系是“雖然…但是…”,though/although不能和but同時出現(xiàn),故答案為D。

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