Test seven27.whydo you stand and watch the milk ______ over?

问题描述:

Test seven27.whydo you stand and watch the milk ______ over?
Test seven
27.why do you stand and watch the milk ______ over?
A)boiling
B)boiled
C)to boil
D)being boiled

考查watch+宾语+v.-ing,表示 看的时候动作正在进行.