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Our teacher,Mr Brown,has a very old camera.He often lets us(

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Our teacher,Mr Brown,has a very old camera.He often lets us( )it,taking pictures here and there.
A make turns to use
B take turn using
C make turns using
D take turns using 为什么填
Many people came to the meeting,of whom( )left early.
A number
B the numbers
C the number
D a number 填哪个为什么填
The police officer want to know what measures(to take ) to find the murderer as soon sa possible.
What (made) him so upset.
The mother didn't know who (to blame) for broken glass.
向 what who 这种词 什么候用 to do 什么时候用 过去分词
第一题,选D,因为take turns doing sth是固定搭配,表示依次做某事,况且后面的taking pictures也暗示了答案doing sth.
第二题,选D.倒过来就是a number of people(whom)表示许多人很早就离开了.
第三问题,修饰物或事的时候用what,修饰人的时候用who.
What (made) him so upset.这里made是what的谓语,表过去发生的事情,所以用过去时;
The mother didn't know who (to blame) for broken glass.这里who和to blame 之间不是主语和谓语的关系,who实际上是to blame的宾语,相当于whom(to blame whom),严格语法讲应该用whom,现代英语口语中他们可以互相交换.