為了解決這個(gè)問(wèn)題,每一個(gè)可能的方法都用過(guò)了,但是對(duì)于我們來(lái)說(shuō)還是很難.
B
用過(guò)用過(guò)肯定已經(jīng)被用過(guò)了!強(qiáng)調(diào)已經(jīng) 所以用現(xiàn)在完成時(shí)!
is used結(jié)構(gòu)上是對(duì)的 但是無(wú)法突出已經(jīng)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 為什么選B而不選A.
A.is used B.has been used 為什么選B而不選A.
英語(yǔ)人氣：659 ℃時(shí)間：2020-03-30 05:29:39
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