题目内容

Scientists ____ thousands of chemicals before they decided on the right one in the end.
A．tried outB．found outC．worked outD．turned out
A

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。
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