He must have been late for the conference yesterday, _______?
A．didn’t heB．hasn’t he
C．mustn’t heD．wasn’t he?
D?
用must have done表示“對(duì)過(guò)去加以推測(cè)時(shí)”，其附加疑問(wèn)部分要根據(jù)must后的動(dòng)詞形式和有無(wú)時(shí)間狀語(yǔ)來(lái)確定用相應(yīng)的時(shí)態(tài)。此句中動(dòng)詞是be，時(shí)間是yesterday，所以用wasn?t he。如果去掉yesterday，就應(yīng)選B項(xiàng)。
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