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题目
题型:不详难度:来源:
Scientists ____ thousands of chemicals before they decided on the right one in the end.
A.tried outB.found outC.worked outD.turned out

答案
A
解析

这题是词组辨析:try out试验 find out查明work out制定出、锻炼 turn out结果是,A符合句意:科学家试验了成千上万的药品才做出正确的决定。
核心考点
试题【Scientists ____ thousands of chemicals before they decided on the right one in t】;主要考察你对动词及动词短语辨析等知识点的理解。[详细]
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