---Your bedroom is so dirty. Would you please Peter?---OK mum. I’ll do it right away.A.

问题补充：

---Your bedroom is so dirty. Would you please , Peter?

---OK, mum. I’ll do it right away.

A. set it up

B. put it on

C. pick it up

D. clean it up

答案：

A. set it up

B. put it on

C. pick it up

(答案→)D. clean it up

解析：set up建立，开业；put on穿上，上演；pick up捡起，收拾；clean up清除，打扫。句意：你的卧室太脏了。你能把它打扫一下吗？彼得。——好吧，妈妈，我立刻就做。结合语境可知选D。