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18．Oh，My goodness!You are still working on the assignment．It __________two days ago．（　�。�

	A．	must have been handed in		B．	can't have been handed in
	C．	should have been handed in		D．	shouldn't be handed in

分析哦，天啦！你還在做作業�。畠商烨熬蛻摻涣耍�

解答答案：C 題干表達的是與事實相反的假設，要用虛擬；句意表達的對過去的事實的相反假設，要用情態動詞加完成時態來構成，表示本應該做而沒有做到的事；must/can't不能用來構成虛擬．故選C．

點評虛擬語氣是表示與事實相反的假設，構成方式有：對現在或將來，條件句中用一般過去時態，主語用情態動詞加動詞原形；對過去，條件句中用過去完成時態，主語用情態動詞加完成時態．學習時，要牢記構成方式．

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