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

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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

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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