单项选择题

I'm sorry, I've______ you waiting outside for a long time.

A．made
B．kept
C．asked
D．told
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单项选择题
Miss Smith came into the lab, ______by her students.
A．following
B．being followed
C．followed
D．having followed
单项选择题
This is not your shirt, but______.
A．yours brother
B．your brother's
C．you brother's
D．yours brother's
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