问题描述：
英语:Tom and Mike will go for a picnic after they _____ their homework.
Tom and Mike will go for a picnic after they _____ their homework.
A.finish B.finished C.will finish D.had finish
Tom and Mike will go for a picnic after they _____ their homework.
A.finish B.finished C.will finish D.had finish
问题解答：
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