they must have finished the work by the end of last month,___?
they must have finished the work by the end of last month,___?
a,mustn't they b,haven't they c,hadn't they d,didn't they
a,mustn't they b,haven't they c,hadn't they d,didn't they
英語(yǔ)人氣：787 ℃時(shí)間：2019-08-19 18:16:35
優(yōu)質(zhì)解答
選C,當(dāng)情態(tài)動(dòng)詞must表推測(cè)時(shí),其反義疑問(wèn)句要根據(jù)實(shí)際情況來(lái)判斷,本題的時(shí)間狀語(yǔ)是by the end of last month,應(yīng)與過(guò)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.所以要選C.
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