主語已經(jīng)是the problem,work out就是指它的
如果是這句話the problem is so difficult that we can't work it out中就要加了,因為這是從句,that后面的主語是we,所以就要加了
the problem is too difficult for us to work out中的work out為什么中間不用it
the problem is too difficult for us to work out中的work out為什么中間不用it
什么時候要加it
so that?還是別的句子
什么時候要加it
so that?還是別的句子
英語人氣：552 ℃時間：2020-08-31 13:52:00
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