【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(dāng)…時(shí)；C. unless除非，如果…不…；D. as long as只要；句意：如果我們不說(shuō)出來(lái)，一些做錯(cuò)的事情仍然會(huì)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(xiàng)正確。

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