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
--Have you finished your homework--Yes, I’ve _______ finished it.
A． already
B． still
C． ever
单项选择题
Bob had his hair _______ yesterday, because it was too long.
A． cut
B． cutting
C． cutted
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