【題目】_____ explorers have known a lot about Mars, there is much that we don’t know.

A. Unless B. As C. Though D. Until

【答案】C

【解析】

試題分析：句意：雖然探險(xiǎn)者已經(jīng)知道了很多關(guān)于火星的事情，但是還有很多我們不知道的。A. Unless除非；B. As作為；C. Though雖然；D. Until直到。根據(jù)句意及語境此題應(yīng)選C。

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