问题描述：
1.After _________practice ,Lang Lang is a wellknown pianist now.A.so many yearB.so many years C.
C.so many year's D.somany years' 2.In my opinion ,a good teacher should be s______ with the students
C.so many year's D.somany years' 2.In my opinion ,a good teacher should be s______ with the students
问题解答：
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