单项选择题

You ______ be more careful next time.

A． may
B． must
C． have to
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单项选择题
We telephoned to ______ our mother's uneasiness (担心).
A． reduce
B． decrease
C． relieve
单项选择题
--How do you go to school --I go to school ______.
A． every day
B． from my home
C． by bus
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