原帖由 annie66 于 2009-2-4 21:03 发表 + s$ u$ g& s6 e: [8 l3 |4 S5 o I'm sure you haven't had Class 7 yet. If you read learner's book, you will know the answer.
* u3 M9 O' T: n, S. e/ T' iI 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?