单项选择题

The most important result of the Lewis and Clark expedition was that it enabled the United States to claim the Oregon region.()

A.regret
B. problem
C. outcome
D. controversy

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单项选择题
The graduate students will convene in the Student Union().

A. converse
B. meet
C. summon
D. raze
单项选择题
At midnight, we were amused by a knock at the door.
A. irritated

B. awakened
C. arisen

D. annoyed
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