—Where did you pick up the stamp?—It was at the post office ________ we worked in the summer vacation.
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A
that
B
where
C
which
D
when
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Those were the graduate assistants ______ to do the research work in the lab.
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A
to whom it was their responsibility
B
whose responsibility there was
C
whose responsibility was
D
of whom with the responsibility
London,______ last year, is a nice old city.
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A
that I visited
B
which I visited
C
I visited
D
where I visited