单项选择题

Why not ______ your schoolbag before you go to school

A． check
B． checking
C． to check
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单项选择题
I ______ up at 7:00 this morning, so I was late for school today.
A． wake
B． woken
C． woke
单项选择题
—Where are my keys —They are covered ______ the dictionary.
A． by
B． with
C． under
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