单项选择题

We can not see things very clearly ______ the fog.

A．because
B．as
C．by
D．in
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单项选择题
Japan lies ______ east of Chin
A． toB. inC. atD. on
单项选择题
______ the teacher's help, he has made great progress.
A．At
B．Under
C．With
D．On
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