有几道英语题目麻烦给出详细解释，谢谢

Question

Lizzie was to see her friend off at the airport.
A.a little more than sad B.more than a little sad C.sad more than a little D.a little more sad than 正确答案是B，可是这个more一直不知道怎么用它
2.Do you enjoy listening to records? I find records are often , or better than an actual performance. A. as good as B.as good C.good D.good as 答案是A
3.Our neighbor has ours. A.as a big house as B.as big a house as C.the same big house as D. a house the same big as 答案是B，可是为什么A不对呢
4.Smoking is so harmful to oersonal health that it kills people each year than automobile accidents. A. aeven more times B. seven times more C. over seven times D.seven times 答案是B
5.Has sam finished his homework today? I have no idea .he it this morning. A. did B.was doing C .has done D.had done 答案是B，为什么不选A

Answer 1

1 more than 是个词组 “不仅仅” 的意思 本题是说 她目送朋友离开 不是一点点的伤心 即 特别伤心 2 as +形容词+ as “和。。一样” 3 这是固定用法 as +形容词+ 冠词+名词 +as 4 这是倍数表达法 数次+times+more than 5 过去进行时 强调过去正在做 但不一定完成了这个工作

Answer 2

1,、D肯定错，more+adj.adj.为单音节要变为sadder，太麻烦了，不解释了

Answer 3

反正D是错的

Answer 4

我也不明白啦