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
It is important that the hotel receptionist ______ that guests are registered correctly.
A．has made sure
B．made sure
C．must make sure
D．make sure
单项选择题
I have heard both teachers and students ______well of him.
A．to speak
B．spoken
C．to have spoken
D．speak
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