单项选择题

They had to______ their way through a mist that was rapidly turning into a thick fog.

A．converge
B．grope
C．strive
D．grip
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单项选择题
Depression remains one of the most______ health disorders in the US.
A．prospective
B．prevalent
C．provocative
D．perpetual
单项选择题
The instruction for the imported machines is so______ that it is impossible for us to operate it.
A．intricate
B．ambiguous
C．duplicated
D．confused
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