题目内容
— Mom, my classmates are playing outside. Can I join them?
— Not until your homework .
| A．finishes | B．is finished | C．finished | D．was finished |
B
解析试题分析：句意：妈妈，我的同学在外面玩，我可以加入他们吗？直到你的作业完成了你才能去。动作的承受者作主语，用被动语态。其结构是，主语+be+done.在时间状语从句中主句用将来时态从句用一般现在时。根据句意，故选B。
考点：考查被动语态的用法。
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