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—______ you please tell me something about the life in Canada?
— Sorry, I______ . I don’t know either. I’m from Australia.
A.Could, couldn’tB.Can; couldn’tC.Could, can’tD.Can, mustn’t
C
could是can的过去式,但有时它只表示委婉语气表示更加礼貌而不是表示时态。
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