单项选择题

I doubt whether he can _______ his efforts much longer as he looks very tired.

A．keep up
B．keep on
C．keep in
D．keep at
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单项选择题
Your failure in the final examination is due to the fact that you didn't _______ enough importance to your English.
A．attend
B．attack
C．attach
D．obtain
单项选择题
When I was in London, it rained _______ every day.
A．frequently
B．usually
C．practically
D．absolutely
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