单项选择题

The child's abnormal behavior puzzled the doctor.()

A. bad
B. frightening
C. repeated
D. unusual

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单项选择题

I recognized him right away even though Richard disguised well.

A. at last

B. on time
C. gradually

D. at once

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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