单项选择题

Our teacher always makes us ______hard.

A． to work
B． work
C． working
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单项选择题
— Tom, you______ take that mistake again. — I won't, Sir.
A． needn't
B． mustn't
C． won't
单项选择题
Mrs. Green is ill. Please send ______a doctor.
A． to
B． with
C． for
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