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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He felt helpless in a situation ______ he could not move himself.
A．where
B．which
C．that
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The increase in student numbers_________many problems for the universities.
A．forces
B．presses
C．provides
D．poses
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