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第1题

36. The old gardener used to keep all his tools and do it yourself equipment in a ____ in the garden.　 (A) barn (B
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第2题

35. Much research _______ into the possible causes of the disease in the past few years.　 (A) has been done (B) wa
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第3题

34. Therefore, other things （）equal, the number of workers that employers want decreases. (A) is (B) are (C)
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第4题

33. Your bike needs_____.You.d better do i right now. (A) clean (B) to be clean (C) being cleaned (D) to clean
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