China's population is expected to increase to about 1.5 billion in 2040, ______it will start to decline slowly.
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A
where
B
which
C
on which
D
after which
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In our factory there are 2,000 workers, two thirds of _______ are women.
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A
them
B
which
C
whom
D
who
The result of the experiment was every good, ______ we hadn’t expect.
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A
when
B
that
C
which
D
what
My close friend Amy was admitted to Oxford University, ______ came as no surprise.
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A
that
B
which
C
it
D
where