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10.Doctors have ________ their research in curing this kind of disease.(  )
A.shown upB.picked upC.stayed upD.stepped up

分析 医生们已经加快了对于治愈这个疾病的研究.

解答 答案D.
根据宾语和状语their research in curing this kind of disease可知医生们已经加快了对于治愈这个疾病的研究,是个选项的含义分别是A"出现,露面";B"捡起,开车接某人";C"熬夜";D"增快,加快",所以答案是D.

点评 开车动词短语辨析.step 的短语用法:
1.名词短语:step by step adv.逐步地; first step 第一步,首要步骤; take steps 采取措施,采取步骤; in step 步调一致; next step 下一步.
2.动词短语:step up 提高,增加;.step by 走过;step in 介入插手干预.

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