—Youdon’tforgetwhenweborrowedthatreferencebook,doyou?<br/>—Ican’tremembernowbut_____sometimelastweek? A: mightitbe B: coulditbe C: couldithavebeen D: shouldithavebeen
—Youdon’tforgetwhenweborrowedthatreferencebook,doyou?<br/>—Ican’tremembernowbut_____sometimelastweek? A: mightitbe B: coulditbe C: couldithavebeen D: shouldithavebeen
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