单项选择题

When Mary finally got there, Tom had left an hour ()

A. before
B. ago
C. later
D. after

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单项选择题
I don’t think she is right, so her words of advice were () on me.

A. wasted
B. useful
C. helpful
D. effective
单项选择题
It is not the()way for America to deal with some problems of Iraq(伊拉克) only by force.

A. important
B. difficult
C. proper
D. exact
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