来自黄长强的问题
Dontletchildwhois________swiminrivers.A.notoldenoughB.tooyoungtoc.notoldenoughtodyoungenoughto选什么,为什么
Dontletchildwhois________swiminrivers.A.notoldenoughB.tooyoungto
c.notoldenoughtodyoungenoughto
选什么,为什么

