Do you know the year ________ the Chinese Communist Party was founded?
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A
which
B
that
C
when
D
on which
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This is the third book that he has written in the past five years, the first of I really enjoyed.
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A
which
B
that
C
those
D
them
My sister ,_____ my family are proud, was admitted to Tsinghua University last autumn.
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A
who
B
which
C
in which
D
of whom
(2013·辽宁六校高三联考)Have you ever seen any trees ________ leaves were black because of the polluted air?
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A
whose
B
that
C
which
D
who
I will never forget the day _____ we worked together in London．
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A
when
B
on that
C
which
D
while