题目内容


Every possible means  _____  .
A．has triedB．has been tried
C．was triedD．were tried
B
考查主谓一致和非谓语动词。句意“每种可能的方法都被试过了。”means和try是动宾关系，应该用被动语态；排除A、C、D。故选B。
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