选出对应的句子。
A:Is this your pen? B:________ . A.No, it is B.Yes, is this C.No, it isn't
A: ________ ? B: Come in, please. A.May I come in B.May I coming C.I am come in
A: ________ that over there? B: It's a cat. A.Who's B.What's C.Where's
A: ________ . B: Not at all. A.All right B.Here you are C.Thank you
A: ________ is David ? B: He is in the classroom. A.Where B.What C.Who
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