1.Your room must have been cleaned yesterday,          ?(  )
A.wasn't itB.haven't itC.hasn't itD.mustn't it

分析 你的房間昨天肯定被打掃過,是嗎?

解答 答案A.反意疑問句,注意前否定,后肯定;前肯定后否定,it替代your room,結(jié)合yesterday,當(dāng)must+have done表示對過去的情況進(jìn)行推測,問句要根據(jù)陳述部分謂語的情況用"didn't+主語"或"wasn't/weren't+主語";這里主語your room,是動詞clean的承受者,結(jié)合yesterday故用過去時被動語態(tài)was+cleaned,故答案是A.

點評 當(dāng)must+have done表示對過去的情況進(jìn)行推測(一般句中有明確的過去時間狀語),問句要根據(jù)陳述部分謂語的情況用"didn't+主語"或"wasn't/weren't+主語";如果強調(diào)動作的完成(一般沒有明確的過去時間狀語),問句要用"haven't/hasn't+主語".She must have read the novel last week,didn't she?她上星期一定讀了這本小說,是嗎?You must have told her about it,haven't you?你一定把這事告訴她了,是嗎?

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