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
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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
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
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