3个英语问题1.he said he (wasn't coming to my partyhe did,though,a

3个英语问题
1.he said he (wasn't coming to my party
he did,though,and brought a wonderful present for you
为什么不能用现在完成时.
2.It was 1945 __ the second world war ended(C)
It was in 1945__the second world war ended(A)
A that B which C when D at which
为什么选这个答案
3.I'm interested in__you said at yesterday's meeting(A)
A.all that B all what C that D which
为什么选A
4.The wind was（改is) still blowing，but the rain has stopped （改had stopped）.
为什么这样改。