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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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
单项选择题
In a sudden ______ of anger, the man tore up everything within reach.
A．attack
B．burst
C．split
D．blast
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