1、The maths problem is too difficult for us to ( ).A、work it

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1、The maths problem is too difficult for us to ( ).A、work it out Bwork out 2、I didn’t know
___ in Guangzhou.How long ______ here?
A.were,have been B.were,have come
急,说明理由

1、B
too…to…结构是简单句中的一种结构.所以不需加it,加it之后就是一句句子拉~
此句还有一种表达是：The maths problem is so difficult that we can't work it out.
2、A
come是短暂性动词,不能与how long提问的短语连用
have been in 指在某地呆了一段时间,后接for+一段时间或其他表示一段时间的短语.

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