单项选择题

It is essential that these application()forms back as early as possible.

A．must be sent
B．will be sent
C．are sent
D．be sent

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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
单项选择题
Nobody but Jane () the secret.

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