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

______ with steam engines, turbines have much higher efficiency.

[A] Compared
[B] While comparing
[C] Compare
[D] Comparing

单项选择题

In the bank he changed his pounds for the ______ amount of dollars.

[A] identical
[B] similar
[C] equivalent
[D] same

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