原帖由 annie66 于 2009-2-4 21:03 发表 ( C& ~5 v6 e) @, z) L; y$ |, V6 t5 ~ I'm sure you haven't had Class 7 yet. If you read learner's book, you will know the answer.
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I read the learner's book 5 years ago, which said one year holding time of class 7 to class 5. Did you take the exam 6 years ago?