Question

To make our city more beautiful, we must remember that rubbish ________ into the river.

[　　]

A．needn't be thrown

B．mustn't be thrown

C．can't throw

D．may not throw

Answer 1

答案：B
提示：

解题点拨 　　此处mustn't表示禁止，rubbish与动词throw之间是动宾关系，应用被动语态．