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，我的同班同学在外面玩，我能加入他们吗？直到你的作业做完才能加入。动作的承受者作主语用被动语态。其结构是，主语+be+done。until引导的时间状语从句，从句用一般现在时表示将来时态，故选B。
考点：考查一般现在时的被动语态。
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