1.The traffic problem we are looking forward to seeing ______should have attracted the local goverment's attention.
A.solving B.sovle C.to solve D.solved
2.What great weight she felt_____off her mind the moment she heard she had passed the driving test.
A.take B.to take C.taking D.taken
3.The journey around the world took the old sailor nine months,_____the sailing time was 226days.
A.of which B.during which C.from which D.for which
(为什么这道题选B不对)
4.A morden city has been set up in ____was a wasteland ten years ago.
A.what B.which C.that D.where
(本题选B为什么不对)

请告知答案并说明理由。谢谢

1.C.这是不定式做后置定语，修饰problem。句中we are looking forward to seeing 是定语从句，修饰先行词problem。全句意思是“我们所盼望看到的要解决的交通问题本应该引起当地政府的关注。”
2.D.过去分词短语taken off做宾语补足语(宾语是great weight).把这个感叹句还原就很容易看出来了:
She felt great weight taken off her mind the moment she heard she had passed the driving test. 当她听说她通过了驾驶考试时,心里的一块大石头落了地. take off是及物动词短语,与weight构成逻辑上的动宾关系,所以要用过去分词.
3. A.of which 意思是"其中" ,也就是说,在这九个月中航行的时间是226天. 226days 与 nine months是所属关系.
4.A. 首先分析这个句子里不含有定语才从句,因为没有先行词,所以不能用which 或that.空格处的连接词在从句中做主语,而where 是副词,不能做主语,这样只有what合适了.