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1 . Now there _________ (exist) a tough issue, so all of us work day and night to solve them. (所给词的适当形式填空)
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2 . 中国文化跌宕起伏的原因是很多的。(ups and downs,定语从句)(汉译英)
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3 . There ______ no buses, we had to take a taxi.
A.being | B.was | C.is | D.were |
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