谁能告诉我关于will 和would 的区别啊,具体的问题是what do you think of his proposal that improvements____in the old type of vacuum cleaner?a)be madeb)will be madec)would be maded)will have to be made但是我怎么也想不通为什么不能用c啊可是我们平时说话的时候不是常常用would来代替will的吗？也表示将要的意思啊

谁能告诉我关于will 和would 的区别啊,具体的问题是
what do you think of his proposal that improvements____in the old type of vacuum cleaner?
a)be made
b)will be made
c)would be made
d)will have to be made
但是我怎么也想不通为什么不能用c啊
可是我们平时说话的时候不是常常用would来代替will的吗？也表示将要的意思啊