单项选择题

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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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
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