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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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
单项选择题
He is quite worn out from years of hard work. He is not the man ______ he was twenty years ago.
A．which
B．that
C．who
D．whom
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