【題目】_____ astronauts cannot go to a baseball game or a movie in space, there are many familiar activities that they can still enjoy.

A．OnceB．UnlessC．WhileD．Since

【答案】C

【解析】while在此句中作為連詞，表讓步，意思是“雖然，盡管”。

句意：

在太空中，宇航員們雖然不能去看棒球比賽或看電影，但那里還有很多相類似的活動(dòng)他們?nèi)匀皇强梢酝娴摹?/span>

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