单项选择题

If you don’ t have as much sleep as your body needs, you will ()

A. work properly
B. think clearly
C. keep your attention on your work
D. easily get angry

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单项选择题
ff the whole operation （）beforehand, a great deal of time and money would have been lost.

A. was not planned
B. has not been planned
C. had not been planned
D. were not planned
单项选择题
Our new house is very （） for me as I can get to the office in five minutes.

A. adaptable
B. comfortable
C. convenient
D. available
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