问题详情：
------Don’t litter the ground, boy ,Look at the sign:: “Rubbish into the dustbin.”
-------Sorry. (2004年襄樊市)
A, has throw B, was throw C, must throw D , must be thrown
【回答】
D
命题立意：本题考查含有情态动词的被动语态的用法。
试题解析：依据句意：垃圾必须扔进垃圾箱里。表示“命令”，句子主语是垃圾，应用被动语态。
知识点：动词语态
题型：选择题
