Question

初中英语单项选择 3道题

1. Is this museum ( ) you visited the other day ?
A. that B. in which C. the one

2. - Where are children ?
- They were ( ) football on the playground just now.
A. play B. playing C. to play

3. -Where is Mark ?
- I think he is in the library because I often see him ( ) in the library at this time of day.
A. studying B. studies C. study

请说明选项以及原因，谢谢了~~
抱歉，第二题 打错了。

2. - Where are children ?
- They were seen ( ) football on the playground just now.
A. play B. playing C. to play

谢谢大家的，各人有各人的选择，我不晓得谁是谁非了。do门or 和 jiajia的似乎有道理，可是也不一样。看得头疼~~

Answer 1

1.A，定语从句
2.B，be doing sth
3.A，see sb do/doing sth，但句子说明是at this time，最好用现在分词

Answer 2

同意二楼，第一个不是定语从句