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【题目】Sometimes wrong doings will stay covered _______ we speak up.

A. if B. when

C. unless D. as long as

【答案】C

【解析】

考查连词辨析。A. if如果;B. when时;C. unless除非,如果…;D. as long as只要;句意:如果我们不说出来,一些做错的事情仍然会被掩盖。根据句意可知应该使用表示否定含义的连词unless。故C项正确。

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