单项选择题

I have to delay（）the letter.

A. to answer
B. answering
C. answer
D. answered

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单项选择题
It is sleeping late in the evening that（）being late for work.

A. devotes to
B. sticks to
C. refers to
D. leads to
单项选择题
Because of the heavy traffic, it was already time for lunch break （） she got to her offiee.

A. since
B. that
C. when
D. until
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