为了解决这个问题,每一个可能的方法都用过了,但是对于我们来说还是很难.
B
用过用过肯定已经被用过了!强调已经 所以用现在完成时!
is used结构上是对的 但是无法突出已经的意思!
Every possible means____to work out the problem,but it is too difficult for us.
Every possible means____to work out the problem,but it is too difficult for us.
A.is used B.has been used 为什么选B而不选A.
A.is used B.has been used 为什么选B而不选A.
英语人气:897 ℃时间:2020-03-30 05:29:39
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