1.There are 1,200 students in this primary school,90%___are

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1.There are 1,200 students in this primary school,90%___are from the countryside.
A.of whom B.of them
选A,B为什么不可以呢?
2.The boy sat under the trees chatting and seeing their teacher ,____up in no time.
A.standing B.stood
选B,A呢?不是表伴随吗?

第一题是定语从名,是一个句子.
如果选B的话那么就成了两个句子了,除非在90%前加上and之类的连词才行,否则是错的.
第二题stood up in no time是说马上站起来了,这里in no time 可以理解为一种时间上的先后,即本来坐着的,一看到老师后就站了起来,整句这可以视为一个时间状语从句,所以用一般过去时就行,用standing后变得后面的动作没有动词了.
这是我对这两题的理解~

1.There are 1,200 students in this primary school,90%___are there are two students in the room,___are discussing somethi There are eight （）students in this school（急, In this school,there are about 200 students ____ music,danci 1.there are two thousands students in our school,________are There are five students in our school there are many students in our school There are students in our school there are () students in our school This is my old school.There are ＿＿＿＿＿students in it now. There are some new students in our school this term.(改为否定句） There are three ____ students in this school.A thousand B th