He made another wonderful discovery, _____ of great importance to science. [

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He made another wonderful discovery, _____ of great importance to science. [ ]
A. which I think it
B. which I think it is
C. which I think is
D. I think which is

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举一反三

The size of the audience, _____ we had expected, was well over one thousand.A. whom
B. who
C. which
D. as

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By serving others, a person focuses on someone other than himself or herself, ____ can be very eye-opening and rewarding.A. who
B. which
C. what
D. that

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Last week, only two people came to look at the house, ____ wanted to buy it.
A. none of them
B. both of them
C. none of whom
D. neither of whom

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I have many friends, _____ some are businessmen.
A. of them
B. from which
C. who of
D. of whom

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For many cities in the world, there is no room to spread out further, _____ New York is an example.

[ ]

A. for which
B. in which
C. of which
D. from which

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