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
after which
D
on which
推荐题目
The pen ________ he is writing is mine. 
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A
with which
B
in which
C
on which
D
by which
Recently I bought an ancient Chinese vase,________ was very reasonable.
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A
the price of it
B
its price
C
the price of which
D
the price of whose
Nowadays, sending e-mails to each other has become a way ______________ what they think to others.
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A
many a student expresses
B
in which more than one student express
C
that most of students express
D
the majority of students expresses