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
I'll never forget ______ you for the first time.
A．to meet
B．to have met
C．meeting
D．having to be meet-
单项选择题
Some educator try to put students of similar abilities into the same class because they believe this kind of ______ grouping is advisable.
A．homogeneous
B．instantaneous
C．spontaneous
D．anonymous
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