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第1题

It was _____ that we went for a picnic in the country.　 (A) such nic e a day (B) such nice day (C) so nice a day
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第2题

By the end of next month I ______ here for five years.　 (A) will work (B) have been working (C) have worked (D)
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第3题

什么是数据库管理系统?
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第4题

Much research _______ into the possible causes of the disease in the past few years.　 (A) has been done (B) was done
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