.Every means tried____ but without much result.a.has been b.have been c.are d.is为什么选A

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.Every means tried____ but without much result.
a.has been b.have been c.are d.is
为什么选A

根据without much result没有多少结果表明句子是完成时,是已经完成的时态,又因为主语是every means 每一种方法,其实是单数,所以用has been