—How often do you clean your classroom? —A. Last weekB. In the afternoonC. For ten minute

问题补充：

—How often do you clean your classroom? —．

A. Last week

B. In the afternoon

C. For ten minutes

D. Every day

答案：

A. Last week

B. In the afternoon

C. For ten minutes

(答案→)D. Every day

解析：句意：你多久打扫你们的教室一次？每天都打扫。对于询问做事情的频率时的回答通常用“多久一次”来回答，故选D。