--Excuse me.Is this seat taken?--____.The man got books left a few minutes agoA.I'm afraid so.B.I don't knowC.I hope not题目记得不清,好象是这个

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--Excuse me.Is this seat taken?--____.The man got books left a few minutes ago
A.I'm afraid so.B.I don't know
C.I hope not
题目记得不清,好象是这个

I'm afraid so