单项选择题

I will have begun to do the work ______ 5 o' clock this afternoon.

A) by
B) at
C) after
D) before
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单项选择题
The time he has devoted in the past years ______ the disabled is now considered ______ of great value.
A) to help; being
B) to helping; to be
C) to help ; to be
D) helping ; being
单项选择题
Mary is always ready to help others when they are in trouble and she never ______ their requests.
A) turns up
B) turns over
C) turns in
D) turns down
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