单项选择题

We’ve tested three hundred types of boot, ______ is completely waterproof.

A. no of which
B. none of which
C. some of that
D. neither of which
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单项选择题
The buses, ______ were already full, were surrounded by an angry crowd.
A. most of which
B. both of which
C. few of them
D. those of which
单项选择题
They are so alike that you can not tell ______ is which.
A. what
B. that
C. which
D. how
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