Clinical evidence began to______, suggesting that the new drugs had a wider range of useful activities than had been predicted from experiments in animals.A.operateB.straighterC.approveD.accumulate
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D解析考察动词。句意为：临床证据开始在积累了，表明了这种新药会将会比之前在动物身上预料的有更加宽阔地运用于很多有用的活动中去。strength，加强；approve，赞成；operate，动手术，操作。