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9、Old McDonald gave up smoking for a while, but soon_____ to his old ways.
A. had returned B. returns C. was returning D. returned
10.---I am going to the United States? ---How long_____ you____ there?
A. are; stayed B.are; staying C. have; stayed D. did; stay
老师帮忙再把句子的意思告诉我.
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