单项选择题

It's no use ______ any longer. He may come by any bus.

A．waiting
B．to wait
C．having waited
D．to have waited
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单项选择题
Linda has lost her wallet again. It is the second time this ______.
A．has happened
B．happened
C．happen
D．was happened
单项选择题
It is no easy job to be a teacher. One has to be extremely patient ______the students.
A．at
B．about
C．on
D．with
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