单项选择题

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
The man sounds
A．surprised.
B．ignorant.
C．humorous.
D．disappointed.
单项选择题
For some time now, world leaders_______out the necessity for agreement on arms reduction.
A．had been pointing
B．have been pointing
C．were pointing
D．pointed
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