Test seven27.whydo you stand and watch the milk ______ over?Test seven27.why do you stand and watch the milk ______ over?A)boilingB)boiledC)to boilD)being boiled

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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.