答案是A.情態(tài)動詞+have +done,表示的是對過去的動作進(jìn)行推測或虛擬.must have been
表示對過去的動作的肯定的推測,“（過去）肯定做過某事”.
選擇題39）An ambulance and some police cars were waiting in front of the house,with doctors running
選擇題39）An ambulance and some police cars were waiting in front of the house,with doctors running
An ambulance and some police cars were waiting in front of the house,with doctors running in and out and some polimen standing nearby.Somebody ________ injured or killed.
A.must have been
B.should have been
C.must been
D.would have been
C是must be
An ambulance and some police cars were waiting in front of the house,with doctors running in and out and some polimen standing nearby.Somebody ________ injured or killed.
A.must have been
B.should have been
C.must been
D.would have been
C是must be
英語人氣：663 ℃時間：2020-04-16 08:13:28
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