初中英语单项选择 1.Is this museum ( ) you visited the other day A.that B.in which C.the one2.- 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 b

初中英语单项选择 1.Is this museum ( ) you visited the other day A.that B.in which C.the one2.- 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 b
初中英语单项选择
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,
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
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~

初中英语单项选择 1.Is this museum ( ) you visited the other day A.that B.in which C.the one2.- 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 b
C.还原为正常语序就很好理解了.This museum is the one （that）you visited the other day.
the one 代替museum,先行词作宾语,可省略.
B.see sb.doing sth.看见某人正在做某事,这里是被动句式.were也没有错,后面的just now说明是过去时态.
A.see sb.doing sth.看见部分过程.