单项选择题

______ it was getting late, we turned back.

A．As
B．Lest
C．So
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单项选择题
The ground is covered ______ snow.
A．of
B．by
C．with
单项选择题
Mike hit ______ and he fell down on the ground.
A．Tom on the head
B．on Tom's head
C．at Tom's head
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