单项选择题

Someone is knocking at the door. It () my mother. It's ……

Someone is knocking at the door. It () my mother. It's time for her to be back.

A．can he
B．may not he
C．must be
D．mustn't be

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热门试题

单项选择题Nobody but Jane () the secret.

A．know
B．knows
C．have known
D．is known

单项选择题My postcard is still on the desk. Why () you () it

A．haven't; posted
B．didn't; post
C．wasn't; posting
D．won't; post