Mr. Smith has been to many famous cities in China, _______ Chengdu has impressed him most.
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in which
B
on which
C
of which
D
with which
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When he came back from abroad, John told his parents about the cities and the people ____ he had visited.
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A
who
B
which
C
where
D
that
The clever boy made a hole in the wall, ________ he could see what was going on inside the building.
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A
on which
B
at which
C
through which
D
in which
_____ is shown in the report, teenager problems are often connected with family lifeeducation.
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A
Which
B
As
C
It
D
What
Many children, _________ parents are away working in big cities, are taken good care of in the village.
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A
their
B
whose
C
of whom
D
with whom