问题标题:
Everypossiblemeans____,butnoneprovessuccessful.A.hasbeentriedB.havebeentried-----------------------
问题描述:
Everypossiblemeans____,butnoneprovessuccessful.
A.hasbeentriedB.havebeentried
-----------------------
韩庆大回答:
A.hasbeen
主谓一致
every修饰的名词用单数
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