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

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英语疑问
1.__seems to be a strong competition in china for senior high students to be admitted into colleges or universities.
A.There B.It ,觉得B选项做形式主语可以吗?
2.-Why didn't you attend the lecture yesterday?
-I didn't think that we ___on sundays.
A.should B.ought to have
C.shouldn't have D.will have to
选项B看作对过去的虚拟可以吗?
3.-John saw a three-year-old child walking alone in a shopping mall.so he took the child home immediately and called the police.
-But he ___have waited with the child until the parents returned.
A.shouldn't B.could C.would D.might
选项是B.选项D might have done 和could have done 都是本可以做某事,但是实际上未做.
4.In the front of the classroom sat a teacher,___students seated around him discussing a hard problem with him.
A.where B.whom C.who D.whose
whom,若先行词a teacher在从句中做宾语,B和C都对啊!
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.