Nowadays，it is common to see people staring at their mobile phones instead of reading a real book，＿＿＿＿＿＿many experts are worried．
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A
when
B
for which
C
where
D
about which
推荐题目
—Where did you see your friend?—It was in the super market ____ I was doing shopping.
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A
where
B
which
C
that
D
when
Finally they arrived at a place _____ sold cigarettes and some other bargains.
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A
where
B
which
C
when
D
what
Do you know the year ________ the Chinese Communist Party was founded?
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A
which
B
that
C
when
D
on which
Gun control is a subject ________Americans have argued for a long time,
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of which
B
with which
C
into which
D
about which
The old town has narrow streets and small houses ________ are built close to each other.
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A
they
B
where
C
what
D
that