I didn’t manage to work out the problem ______ the teacher had explained how.

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问题 I didn’t manage to work out the problem ______ the teacher had explained how.

选项 A、until
B、unless
C、when
D、before

答案A

解析

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本试题收录于：公共英语二级笔试题库公共英语（PETS）分类

公共英语二级笔试

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