(2009·陕西)Gun control is a subject ________ Americans have argued for a long time.
#30490
A
of which
B
with which
C
about which
D
into which
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Many people claim that they have seen UFO with their own eyes, _____ I personally doubt.
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A
that
B
which
C
when
D
where
How did you manage to get to school on time ______ you missed the school bus?
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A
when
B
if
C
once
D
because
— Why didn't you stop her going swimming alone? — She had left the room _____ I had time to do it．
#31660
A
after
B
before
C
till
D
as
The question_______ you should take this medicine should be decided by your family doctor.
#31612
A
why
B
whether
C
if
D
that