单项选择题

Don't ______ to let me know if there is anything I can do for you.

A. reject
B. prevent
C. hesitate
D. refuse
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单项选择题
There is ______ that well-educated citizens should devote their knowledge and skills to their own country and people.
A. no deny
B. no denying
C. not deny
D. not denied
单项选择题
Frankly speaking, I'd rather you ______ anything about it for the time being.
A. didn't do
B. haven't
C. didn't
D. have done
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