Answer a) is incorrect only b) works as a response to the statement in A:
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exodejavuA:I think Sam has been to America several times.'has been' is present tense, so 'did' is not correct because it refers to the past.
B:I guess he___.
a) did
b) has
KooyeenHowever, I don't think "I guess he did" is a completely impossible answerI can assure you, Kooyeen, that if you were standing around the water cooler in AnyPlace, USA and someone said to you,
RayHKooyeenHowever, I don't think "I guess he did" is a completely impossible answerI can assure you, Kooyeen, that if you were standing around the water cooler in AnyPlace, USA and someone said to you,
A:I think Sam has been to America several times.
and you answered,
B:I guess he did.
you would get some