单项选择题

—Where are my keys
—They are covered ______ the dictionary.

A．by
B．with
C．under
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单项选择题
______ the end, he finished doing his homework and went to sleep.
A．At
B．In
C．On
单项选择题
I will tell you ______ he said to me if I can.
A．what
B．which
C．that
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