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问题: Why do you stand and watch the milk ____ over ?

Why do you stand and watch the milk ____ over ?
A boiling
B boiled
C from boiling
D. being boiled

解答:

选 A . watch .... doing/do, 此处是正在进行的动作,所以用dong.而牛奶煮沸溢出是主动的,所以选A,boil over 是煮沸溢出的意思