【題目】You will fall behind others ______ you work hard.

A. while B. until C. unless D. when

【答案】C

【解析】

試題分析：句意：如果你不努力學習，你就會落在別人后面。此題考查連詞，A然而；B直到，才；C如果不；D當……時候。根據(jù)句意，應(yīng)選C。

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