much is known about the surface of Mars, what happened during a long time remains unknown. [ ] A．ForB．WhileC．SinceD．Because 题目和参考答案——青夏教育精英家教网—

题目内容

________ much is known about the surface of Mars, what happened during a long time remains unknown.

[　　]

A．For

B．While

C．Since

D．Because

答案：B
解析：

根据题意，此处应表示“虽然”，只有B项while可表示此意。since意为“既然”。

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