单项选择题

They stayed up late trying to ______ out a way to solve the problem.

A．let
B．give
C．knock
D．figure
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单项选择题
Mother always puts the knife beyond the reach of the kids lest they ______ it.
A．had taken
B．took
C．would take
D．should take
单项选择题
______ with steam engines, turbines have much higher efficiency.
A．Compared
B．While comparing
C．Compare
D．Comparing
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