单项选择题

All the ground was covered ______ snow last night.

A．by
B．in
C．with
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单项选择题
By the end of the ______ century(世纪，百年) ,computers may be seen in every home.
A．twenty-first
B．twenty-oneth
C．twentieth-one
单项选择题
Can you tell me ______ the time is now
A．how long
B．which
C．what
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