有几个英语问题 拜托帮忙解答一下

题目

有几个英语问题 拜托帮忙解答一下
1) George is going to talk about the geography of his country ,but I'd rather he ---more on its culture
A .focus B .focused C.would focuse D had focused 为什么选b 而不是c 可不可以用单三
2)The lady wlked around the shops ,----an eye out for bargains
A.keep B kept C keeping D to keep 为什么 选c 而不是d
3）the traffic rule says young childern under age of 4 and ----less than 40 pounds must be in a child safety seat
A bing weight B to weight C weighted D weight ing 为什么 选d而不是c

答案

1）would rather...宁愿……是虚拟语态,用一般过去式,不能选C
2）动名词短语做状语表达句子谓语的行为方式,而不定式表示目的.
3）weight的意思是”有……重“,”给……称重“,表达后一个意思是不说weight somebody...