单项选择题

At three thousand feet, wide plains begin to appear, and there is never a moment when some distant mountain is not ______.

A．on view
B．at a glance
C．on the scene
D．in sight
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单项选择题
Prof. Lee's book will show you ______ can be used in other contexts.
A．that you have observed
B．that how you have observed
C．how that you have observed
D．how what you have observed
单项选择题
Give me your telephone number ______ I need your help.
A．whether
B．unless
C．so that
D．in case
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