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
Millions of Americans flock to their drugstores to buy vitamins and minerals, ______ that these pills can help to prevent serious illnesses.
A．convincing
B．convinced
C．to convince
D．to be convinced
单项选择题
Everything we eat and drink contains some salt; we can meet the body''s need for it from natural sources without turning ______the salt bottle.
A．up
B．to
C．on
D．over
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