Scientists ____ thousands of chemicals before they decided on the right one in the end. A．tried out ...
2023-01-23 05:42:12 182次 2013届安徽省高二3月月考英语试题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Scientists ____ thousands of chemicals
before they decided on the right one in the end.
|
A．tried out
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B．found out
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C．worked out
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D．turned out
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