单项选择题

I tried hard, but I couldn’t find the ______ to the problem.

A. solution
B. help
C. reply
D. demand
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单项选择题
I agree with him ______, but not entirely.
A. until a certain point
B. to some point
C. to some extent
D. until a certain extent
单项选择题
Lisa was busy taking notes ______ Mark was searching the Internet for the information.
A. until
B. unless
C. while
D. if
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