单项选择题

54. He was punished ______ he should make the same mistake again.

A．unless
B．provided
C．if
D．lest
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单项选择题
We shall probably never be able to ______ the exact nature of these sub-atomic particles.
A．assert
B．impart
C．ascertain
D．notify
单项选择题
They believed that this was not the ______ of their campaign for equality but merely the beginning.
A．climax
B．summit
C．pitch
D．maximum
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