单项选择题

I don't think you two know each other,（）

A. do I
B. don't I
C. do you
D. don't you

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单项选择题
Goodbye, Mr. Smith. I'm very pleased（）

A. to meet you
B. to have met you
C. meeting
D. having met you
单项选择题
Wilma became the first American woman to win three Olympic gold medals in track,（）made her mother very proud.

A. it
B. that
C. which
D. this
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