選B：must have done 表示對過去發(fā)生行為的推測,意思是“一定,準是”,只用于肯定句中.本題中,根據(jù)
.It was very difficult（考試很難）可知,他準是掛科了.
A選項,shoud have done 對過去應(yīng)該做而沒有做的行為的責(zé)備.本該...（實際上沒做）如：You should have been here ten minutes ago.
你本應(yīng)該10分鐘之前來到這.（實際上沒有）
C項 表示"義務(wù),責(zé)任" 意思是“應(yīng)該”
D項 不能表示對過去行為的推測
Peter loos very upset.Anything wrong?He_____in the exam.It was very difficult
Peter loos very upset.Anything wrong?He_____in the exam.It was very difficult
A.should have failed B.must have failed C.should fail D.must fail
A.should have failed B.must have failed C.should fail D.must fail
英語人氣：216 ℃時間：2019-12-10 02:29:59
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