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
______ with steam engines, turbines have much higher efficiency.
A．Compared
B．While comparing
C．Compare
D．Comparing
单项选择题
A．passionB．preferenceC．performanceD．potential
A．passion
B．preference
C．performance
D．potential
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