单项选择题

—I'm sorry for keeping you waiting.
—Never mind. I ______ here only a few minutes.

A. came
B. have come
C. was
D. have been
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单项选择题
Knock______the door before you enter the room.
A. on
B. for
C. at
D. in
单项选择题
I wanted to thank them for all their ______.
A. kind
B. kindly
C. kindness
D. kindnesses
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