Tom,you are so lazy!This work------hours ago.A.should finish B.must have finishedC.should have been finished D.might have finished这题为什么选c而不选B了?

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Tom,youaresolazy!Thiswork------hoursago.A.shouldfinishB.musthavefinishedC.shouldhavebeenfinishedD.mi

Tom,you are so lazy!This work------hours ago.A.should finish B.must have finishedC.should have been finished D.might have finished这题为什么选c而不选B了?
Tom,you are so lazy!This work------hours ago.
A.should finish B.must have finished
C.should have been finished D.might have finished
这题为什么选c而不选B了?

Tom,you are so lazy!This work------hours ago.A.should finish B.must have finishedC.should have been finished D.might have finished这题为什么选c而不选B了?
B是主动式,C 是被动式.本句要用被动.

C. should have been finished.

因为这是语法问题!
我们老师说这是固定搭配!