单项选择题

After I ______ for half an hour, I realized that he was not coming.

A．have waited
B．waited
C．had been waiting
D．was waiting
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单项选择题
He is a man who is never ______ reading newspapers all day long,
A．tiring of
B．tired from
C．tired of
D．tiring from
单项选择题
I have no idea what Mary ______ at this time tomorrow.
A．will be doing
B．is doing
C．will do
D．does
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