Every means has been _______. No one is effective.
A．trying outB．tried outC．trying inD．tried on
B
詞組辨析題。句意：每一種方法都嘗試過了，沒有一個(gè)有效。Try out 嘗試，try on 試穿；根據(jù)語(yǔ)境可知“方法”是被“嘗試”所以要用過去分詞表被動(dòng)。選B
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