单项选择题

______, the new electronic device they designed is now in regular operation.

A．With the solved problem
B．With this problem being solved
C．With the problem solved
D．With this problem to solve
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单项选择题
There was no sense ______ him to come early since everything was ready.
A．to ask
B．to have asked
C．in asking
D．being asking
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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