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A. Have you been to Canada before？B.（）.
A. Have you been to Canada before？B.（）.
A.No， I have
B.Yes， I have
C.Yes， I did
正确答案：B
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A. Have you ever seen the film The Day After Tomorrow？B.（）.
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A. Can you help me with my homework？B.（）else can.You have to do it yourself.