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
I am ______ to hear your good news.
A．wrong
B．good
C．glad
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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