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

A. if B. when

C. unless D. as long as

【答案】C

【解析】

考查連詞辨析。A. if如果；B. when當…時；C. unless除非，如果…不…；D. as long as只要；句意：如果我們不說出來，一些做錯的事情仍然會被掩蓋。根據(jù)句意可知應(yīng)該使用表示否定含義的連詞unless。故C項正確。

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