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Every possible means_____ been tried，and we find only______ this means can we do it well．
A．have，inB．have，by
C．has，inD．has，by
D
其余幾項均容易被誤選。這里主要涉及名詞means（方式，方法，手段）的用法與搭配：means 單復同形，every means意思是“每一個方法”故謂語動詞應為單數(shù)；“通過某種方式”，介詞用by固定搭配。故選項中只有D正確。
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