单项选择题

__________ boy and __________ girl knows what they should do next.

A．Both; /
B．No; each
C．Every; every
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单项选择题
― __________ will Jim be back ―In a few weeks.
A．How long
B．How often
C．How soon
单项选择题
You __________ tell anybody about this―it's a secret.
A．can't
B．mustn't
C．needn't
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