请帮做选择题

来源:百度知道 编辑:UC知道 时间:2024/05/11 19:23:23
1. Don’t you know he is an old friend of _______?
a. my brother b. my brothers c. my brother’s d. my brother’s friend
2. ____ you return those books to the library immediately, you will have to pay a fine.
a. Until b. Unless c. If d. Provided
3. Let’s hurry up, ______?
a. do we b. didn’t we c. will we d. shall we
4. The river was high because it _____ for several weeks.
a. had been raining b. was raining
c. has been raining d. rained
请讲讲为什么要选择这个的?

1 c 表示从属关系的,of后面用名词性的无助代词或是人物的's形式
2 b 表示一种假设,除非你立即把这些书归还给图书馆,否则要缴纳罚金。
3 d let's是缩写形式时,反义疑问句要用shall we ?
4 a 前面用了was,是过去时,是因为这几周一直在下雨,用过去完成进行时

1.c 2.b 3.d 4.a