几个英语问题1 He was becoming fat,____bothered him very muchC what

几个英语问题
1 He was becoming fat,____bothered him very much
C what D which
从句缺主语不应该是选C吗 为什么选D
2 So far there is no proof___spaceship from other planets do exist
B that D what 为什么选B啊
3_____hard he tried,he could not lift it
C however D although
这不是一个让步状语吗 为什么选C啊
4 There was not a small house in the village____he had not brought food and comfort
C to which D in which 为什么选C啊
5 That is the school____last year
B at which I studied D in where I studied 为什么选B啊
6 I decided to go to the library as soon as I____
C finished what i did D finished what i was doing 为什么选D
7____,he often helps me with my study
A however he is busy D no matter how busy he is 为什么选A
8 I am to go to Manchester next month.I will visit Martin____I went there
B when C once 为什么选C
PS：实在没有财富了.只能无偿回答了,不好意思,