Question

As everyone knows, rubbish _______ everywhere.

A．need be thrown	B．mustn’t be thrown
C．can’t throw	D．may throw

Answer 1

B

动词语态。。垃圾rubbish和throw为被动关系，应用被动语态。排除C和D。句意为“每人都知道的，到处都禁止扔垃圾”。Mustn’t表禁止。故选B。