单项选择题

He didn't know I was in his office. He was too busy to ______ me.

A．pay attention to
B．notice
C．know
D．realize
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单项选择题
Music often ______ us of events in the past.
A．reminds
B．memorizes
C．remembers
D．reflects
单项选择题
You should turn off all the water tonight ______ water freezes and the pipes burst.
A．in some cases
B．in case
C．in that case
D．in any case
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