单项选择题

Children don''t ______understand what they are reciting, but gradually it will have an impact on their thinking.

A．necessarily
B．profitably
C．unnecessarily
D．unprofitably
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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
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
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