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I like climbing mountains（）my wife prefers water sports.

A. as
B. for
C. when
D. while

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单项选择题

We need someone really（）who can organize the office and make it run smoothly.

A. executive
B. effective
C. essential
D. efficient

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At the meeting both sides exchanged their views on a wide（）of topics they were interested in.

A. collection
B. density
C. extent
D. range

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