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

這題是詞組辨析：try out試驗 find out查明work out制定出、鍛煉 turn out結(jié)果是，A符合句意：科學(xué)家試驗了成千上萬的藥品才做出正確的決定。
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