When you ( ) all your homework,we can go to the park and...下
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When you (D have finished ) all your homework,we can go to the park and picnic there on the lake side.当你完成所有作业,我们可以去公园在湖边野餐.

A will finish 将来时 B will have finished 将来完成时 C are finished 被动语态 D have finished 现在完成时,只能是现在完成时态,才符合语言环境