题干
The teacher told me _________when I left the classroom.
A：lock the door
B：to lock the door
C：to knock at the door
D：knock at the door
答案(点此获取答案解析）
B
The teacher told me _________when I left the classroom.
A：lock the door
B：to lock the door
C：to knock at the door
D：knock at the door
