单项选择题

I have two grammars, ______ are of great use.

A. all of which
B. either of which
C. both of that
D. both of which
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Air, or （）is called the atmosphere, surrounds the whole world.

A. it
B. which
C. what
D. that
单项选择题
— I don’t like chicken （）fish. —I don’t like chicken, （）I like fish very much.

A. and; and
B. and; but
C. or; but
D. or; and
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