( )——Do you mind my_____the window?

问题描述:

( )——Do you mind my_____the window?
——_____.It's really cold outside today.
A.were watching;while B.watched;while C.were watching;when D.watched;when

顺便求问为什么是watch.第一句没看懂我也不懂才问的。。。还有为什么是were watching和when ?