原帖由 annie66 于 2009-2-4 21:03 发表 0 }/ H! C* f& g2 D/ g6 s& K* _ I'm sure you haven't had Class 7 yet. If you read learner's book, you will know the answer.
5 z5 x9 x1 l/ e# u) k, GI 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?