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

◎ 题干

Scientists ____ thousands of chemicals before they decided on the right one in the end.

A．tried out

B．found out

C．worked out

D．turned out

◎ 答案

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◎ 解析

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◎ 知识点

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