1.He ____(look) round when he heard the sound behind him.
问题描述：
1.He ____(look) round when he heard the sound behind him.
2.I ____(show) them around our school when they get there.
3.Where ____you____(be)?
To the library.
请用括号内词语正确的形式填空,最好能说明理由.
答
1.He was looking(look) round when he heard the sound behind him.
2.I will show (show) them around our school when they get there.
3.Where have you been (be)?
To the library.
---绝对正确!