单项选择题

We had to wait a long time to get our visas, ______

A. don't we
B. mustn't we
C. haven't we
D. didn't we
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He gave me another pair of white slippers, ______ I tried on at once.
A. that
B. which
C. what
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I had no doubt in my mind ______ they would be glad to see me.
A. if
B. whether
C. why
D. that
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