Question

英语疑问1.__seems to be a strong competition in china for senior

Answer 1

1.不能用 it,因为将to的不定式放到句首读不通,选there是因为它是 there be的句型（there seems to be）

2.不能选 ought to have,时态不对,问 why didn't 是过去时,答 ought to have 成了完成时

3.选B的意思是：原本可以,如果选D might have done 变成了原本可能,不通

4.是的,who 和 whom 都行,但在单选题中要选最佳答案,whom体现了teacher在从句中作宾格,比who好,因此选B.