-Mr Wu must have been to your house yesterday morning.-No,he___.Because he didn't know my address.could't?can't?哪个?

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-MrWumusthavebeentoyourhouseyesterdaymorning.-No,he___.Becausehedidn''tknowmyaddress.could''t?can''t?哪个

-Mr Wu must have been to your house yesterday morning.-No,he___.Because he didn't know my address.could't?can't?哪个?
-Mr Wu must have been to your house yesterday morning.-No,he___.Because he didn't know my address.
could't?can't?哪个?

-Mr Wu must have been to your house yesterday morning.-No,he___.Because he didn't know my address.could't?can't?哪个?
could't根据前文提到的yesterday知道时态是过去时,还可以根据后面的回答didn'判断出时态是过去时.因此用could not.