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
Every means ______ since then.
A．has been trying
B．have been trying
C．have been tried
D．has been tried
单项选择题
Hardly had he finished his speech ______ the audience started cheering.
A．then
B．when
C．than
D．as
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