Question

The math teacher gave us some exercises and asked us ___.

A to work them on B to work on them选择哪一个 。说明原因，在线急等 谢谢

Answer 1

一般来讲，由动词+副词所构成的短语动词，如代词it/them作它的宾语时，要把it/them放在其中间;由动词+介词所构成的动词短语，如it/them作它宾语时，要将其放在后面。
1.由动词+副词
put down/on/off/in...
take out/up/down/off...
get on/off/down/....
hold back/down...
look up....
2.由动词+介词
look after/over/for...
take on/after....
get over/into...
put into...3而本题on 是作介词，所以them 放后面， 选b

追问

但我查词典 work on 怎么写的是动副短语呢

Answer 2

to finish then

Answer 3

B
数学老师给了我们一些练习并让我们做。

Answer 4

额

Answer 5

B