单项选择题


A．and
B．for
C．if
D．when
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单项选择题
A．damageB．destroyC．createD．break
A．damage
B．destroy
C．create
D．break
单项选择题
I had been working a couple of months ______ I had a letter from Mike.
A．when
B．until
C．that
D．while
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