用介词填空.1.Who is _duty today?2.What class are you_?3.His father is a teacher_ No.4 Middle School.4.Look!Who is the boy _th
问题描述：
用介词填空.1.Who is _duty today?2.What class are you_?3.His father is a teacher_ No.4 Middle School.4.Look!Who is the boy _the picture.5.Welcome_ China,Mr.Green.
答
1 on ( on duty 值日）
2 in 在
3 of ……的
4 in 在
5 to （欢迎到中国）