单项选择题

A beam of light will not bend round the corners unless ______ to do so with the help of a reflecting device.

A．being done
B．made
C．to be made
D．having made
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单项选择题
You had better ______ teasing these newcomers, for that will hurt their feeling.
A．leave out
B．leave for
C．leave off
D．leave behind
单项选择题
If you play with electricity, you may get an electric ______.
A．strike
B．beat
C．shock
D．knock
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