18.Oh,My goodness!You are still working on the assignment.It __________two days ago.(  )
A.must have been handed inB.can't have been handed in
C.should have been handed inD.shouldn't be handed in

分析 哦,天啦!你還在做作業(yè)啊.兩天前就應(yīng)該交了.

解答 答案:C 題干表達(dá)的是與事實(shí)相反的假設(shè),要用虛擬;句意表達(dá)的對過去的事實(shí)的相反假設(shè),要用情態(tài)動詞加完成時態(tài)來構(gòu)成,表示本應(yīng)該做而沒有做到的事;must/can't不能用來構(gòu)成虛擬.故選C.

點(diǎn)評 虛擬語氣是表示與事實(shí)相反的假設(shè),構(gòu)成方式有:對現(xiàn)在或?qū),條件句中用一般過去時態(tài),主語用情態(tài)動詞加動詞原形;對過去,條件句中用過去完成時態(tài),主語用情態(tài)動詞加完成時態(tài).學(xué)習(xí)時,要牢記構(gòu)成方式.

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