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
答案：B
提示：

　　解題點(diǎn)撥

　　此處mustn't表示禁止，rubbish與動(dòng)詞throw之間是動(dòng)賓關(guān)系，應(yīng)用被動(dòng)語態(tài)．


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