单项选择题

I' m grateful because you have taken ______ to show me how to do the work.

A．efforts
B．pains
C．attempts
D．endeavors
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单项选择题
He is a very honest official and never ______ any gifts from the people who sought his help.
A．accepted
B．received
C．took up
D．excepted
单项选择题
Paris is one of the most beautiful ______ in the world.
A．city
B．cities
C．citys
D．country
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