—Johnny,you______ play with matches,you______burn yourself.
问题描述：
—Johnny,you______ play with matches,you______burn yourself.
A.won't ; can't B.mustn't ; may C.shouldn't ; must D.can't ; shouldn't
答
b第一个表示明令禁止,第二个表示可能的后果,有虚拟的成分在里面.