explorers have known a lot about Mars.there is much that we don't know．( )A．UnlessB．AsC．ThoughD．Until 题目和参考答案——青夏教育精英家教网—

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2．_____ explorers have known a lot about Mars，there is much that we don't know．（　　）

A．

Unless

B．

C．

Though

D．

Until

分析虽然探险家已经知道了许多关于火星的知识，但还是有很多是我们不知道的．

解答正确答案：C．
unless引导条件状语从句，表示除非、如果不．as可引导时间或原因状语从句，表示当…时候，因为．though引导让步状语从句，表示虽然、即使．until引导时间状语从句，表示到…为止，not…until表示直到…才．根据句意虽然探险家已经知道了许多关于火星的知识，但还是有很多是我们不知道的，可知句子前后是转折让步关系，故选择C．

点评本题考查从属连词，首先需清楚各连词的含义及其引导的从句，其次根据主从句关系及句意作出选择．

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