单项选择题

—May I come in —______.

A．Yes, please
B．No, you couldn't
C．No, you 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
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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