单项选择题

My brother ______ hard and succeeded at last.

A． works
B． worked
C． work
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单项选择题
Mary always got up too late, and never ______ enough time for breakfast.
A． have
B． has
C． had
单项选择题
It's getting dark. Please ______ the light.
A． turn on
B． turn off
C． turn down
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