单项选择题

I am busy ______ my homework these days after three day's away.

A． do
B． doing
C． in doing
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单项选择题
Would you please walk a little ______, I am in a hurry now.
A． more fast
B． more lastly
C． faster
单项选择题
These books must not be taken ______ from the library.
A． off
B． away
C． down
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