单项选择题

They（）the work in spite of the extremely difficult conditions.

A.carried on
B.carried off
C.carried out
D.carried forward

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The weather in Beijing is so dry that I can hardly adjust（）life there.

A.to
B.in
C.on
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Almost two thirds of the land in the northwest areas of the country（）suitable for farming.

A.are not
B.is not
C.can not
D.not being
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