【題目】_____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(xué)家已經(jīng)對火星進行了大量研究,但仍有很多有待于去發(fā)現(xiàn)。if如果;since自從;unless除非;though雖然。根據(jù)前后關(guān)系可知表示讓步,故選D。

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