You must keep on working in the evening, ______ you are sure you can finish the task in time

A．a(chǎn)s               B．if                 C．when                 D．unless

D 

解析： 此題考查了連詞的用法。unless引導(dǎo)一個(gè)狀語(yǔ)從句，意思為與if…not…，這要根據(jù)句子的意思來(lái)做出判斷的。誤選C，是沒有對(duì)句子的意思正確的理解。句意為：你必須在晚上繼續(xù)工作，如果你不能夠確信你會(huì)按時(shí)完成的話。

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