You will fall behind others ____________...

You will fall behind others ____________ you work hard.

A. unless B. though C. if D. since

A 【解析】试题分析：句意：除非你努力学习，否则你会落在别人后面的。unless 除非，如果不；though尽管，虽然；if如果；since自从，既然。根据句意可知，这句话的意思是如果你不努力学习，就会落后。因此应该选A。考点：考查连词。

考点分析：

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