1,this pair of trousers is too long for myyounger brother to

1,this pair of trousers is too long for myyounger brother to wear,----- A are they B is there C is it D aren't they 选B句子有否定吗,没有吧,前肯后否,2,It was because of bad weather-----the football match bad to be put off.A so B so that C why D that 选D为什么?3,If only I-----this movie be fefore.A see B saw C have seen D had seen 选B 不是完成时吗?