—Go and have great fun!I will cope with you leave to me properly.—Thanks a lot. A. whyB.

问题补充：

—Go and have great fun!I will cope with you leave to me properly.

—Thanks a lot. 

A. why

B. when

C. what

D. which

答案：

A. why

B. when

(答案→)C. what

D. which

解析：这里考查what引导的名词性从句，what在从句中作宾语。leave sth.to sb.将某事留给某人处理。句意为：——好好玩吧！我会把你交给我的事情处理好的。——多谢。