Every possible means  _____  .
A．has triedB．has been tried
C．was triedD．were tried
B
考查主謂一致和非謂語動詞。句意“每種可能的方法都被試過了�！眒eans和try是動賓關(guān)系，應(yīng)該用被動語態(tài)；排除A、C、D。故選B。
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