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