单项选择题

The director was critical ______ the way we were doing the work.

A．at
B．in
C．of
D．with
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单项选择题
She ought to stop work; she has a headache because she ______ too long.
A．has been reading
B．had read
C．is reading
D．read
单项选择题
It seems oil ______ from this pipe for some time. We'll have to take the machine apart to put it right.
A．had leaked
B．is leaking
C．leaked
D．has been leaking
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