They must have finished the work by the end of last month, ______?
A．hadn’t theyB．mustn’t theyC．haven’t theyD．didn’t they
A

試題分析：句意：他們上個(gè)月的月底一定已經(jīng)完成了這項(xiàng)工作，不是嗎？當(dāng)情態(tài)動(dòng)詞must表推測時(shí)，其反義疑問句要根據(jù)實(shí)際情況來判斷，本題的時(shí)間狀語是by the end of last month,應(yīng)與過去完成時(shí)連用，還原一下本題應(yīng)為：They had finished the work by the end of last month.故選C。
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