I have many foreign friends,         some are businessmen. 
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A
of them
B
from which
C
who of
D
of whom
推荐题目
At present, we are studying a total of nine subjects, ________ I think is physics.
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A
of them the most difficult
B
and the most difficult of which
C
the most difficult of them
D
the most difficult of which
____is well known, Taiwan is part of China.
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A
As
B
That
C
Which
D
It