单选题
Every means ______ but without much result.
A、
have been tried
B、
has been tried
C、
have tried
D、
has tried
【正确答案】
B
【答案解析】
every means(每一种方法)为单数概念，方法是被人来试的，所以means与try之间是被动关系，正确答案为B。
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