单项选择题

-- I'm sorry for keeping you waiting.
-- Never mind. I () here only a few minutes.

A. came
B. come
C. was
D. have been

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单项选择题

While () in China, the young man picked up some Chinese.

A. staying
B. stay
C. stayed
D. to stay

单项选择题

--When did it begin to snow--It started () the night.

A. during
B. by
C. from
D. at

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