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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单项选择题
The children ______ before they work in the Restaurant.
A．must be trained
B．must be over seven years old
C．should know how to read and write
单项选择题
The Restaurant is welcomed ______.
A．only by children
B．only by old people
C．almost by everyone
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