a.
因?yàn)楹竺婺蔷湓捠?it is difficult 已經(jīng)有了主詞 (it)
the maths problem isn't very easy and it is difficult
the maths problem isn't very easy and it is difficult
a to finish
b to finish it
a to finish
b to finish it
英語(yǔ)人氣：931 ℃時(shí)間：2020-02-06 05:43:53
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