单选题 John, you ______ play with the knife, you ______ hurt yourself.
   A) won't; can't                       B) mustn't; may
   C) shouldn't; must                    D) can't; shouldn't
【正确答案】 B
【答案解析】mustn't表示“禁止,不准,不允许”;may表示可能。句意:不准玩刀子,你可能会伤到你自己。