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__________ my return,I heard that my parents ___________ at

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__________ my return,I heard that my parents ___________ at the supermarket.
A.At;went B.On;have been C.On;had been D.During;had been
答案C “on +表示动作意义的名词/动名词”形式,意为“一……就……”;主句为过去时,宾语从句动作发生在主句之前,从句应用过去完成时.答案为C.查看原帖