Today，we’ll discuss a number of cases ________ parents have much difficulty in communicating with their children.
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A
which
B
as
C
why
D
where
推荐题目
Our neighbor offered to look after our baby yesterday when we were busy, _____is often the case.
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A
it
B
that
C
which
D
as
Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.
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A
into; from
B
towards; towards
C
out of; from
D
through; through
Gun control is a subject ___ Americans have argued for a long time.
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A
of which
B
with which
C
about which
D
into which
His opinion was such a good one _________ his family all agreed to accept．
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A
which
B
and
C
that
D
as