Last night Li Ping watched the football match at home when he ________ his homework.
A．need have done B．must haven done
C．should have doneD．could have worked
C
考察虛擬語氣。句意：當(dāng)他應(yīng)該寫作業(yè)的時候，昨晚麗萍在家看足球比賽了。“should+have+done”意思是“本來應(yīng)該做某事，而實際沒做。”故選C。
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