单项选择题

—You must be here at six tomorrow morning.—Sorry, I ______ be here so early.

A． can't
B． may
C． must
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单项选择题
My mother often tells me ______ the past.
A． not to forget
B． to not forget
C． to not remember
单项选择题
I'll let you know as soon as he ______.
A． came back
B． comes back
C． will come back
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