4. which---whose, 哪一本书的,表所属关系
5. what---that/which或省略, 在从句中作宾语,从句中省略动词 do.
6. It---As,两个句子需连词连接,不可同时存在,分为主从句。
7. when---that/which,从句中作宾语。
8. them---which,指代 glasses,非限制性定语从句。
9. that---which,指代前整个主句。
10. where---that,强调句,It was ...... that ......
11. who---whom,介词后跟宾格形式。
12. that---which, 非限制性定语从句,指代前整个主句。
13. who---that或去掉,从句中作宾语。
14. wants---want,Those 为复数,从句中谓语动词应为原型。
15. have--has,指代一个人,应体现单数形式。
还有别的啊
追答7, when — that
8, them — which
9, that — which
10, where — that
11, who — whom
12, that — which
13, who — that
14, wants — want
15, have — has
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