单项选择题

These two bags are very good. You can choose ______ of them.

A．both
B．each
C．either
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— Tom, you______ take that mistake again. — I won't, Sir.
A．needn't
B．mustn't
C．won't
单项选择题
Our teacher always makes us ______hard.
A．to work
B．work
C．working
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