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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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
单项选择题
Every means ______ since then.
A．has been trying
B．have been trying
C．have been tried
D．has been tried
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