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
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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
单项选择题
Only under special circumstances ______ to take make-up tests.
A．are freshmen permitted
B．freshmen are permitted
C．permitted are freshmen
D．are permitted freshmen
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