单项选择题

If you don't know how to read or use a word, you'd better ______ in a dictionary.

A． look it for
B． look up it
C． look it up
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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
单项选择题
My mother often tells me ______ the past.
A． not to forget
B． to not forget
C． to not remember
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