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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单项选择题
With the development of the Internet, people' s life ______ in the past few years.
A) is improved
B) has been improved
C) is improving
D) had been improved
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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