单项选择题

That job is quite difficult. I can understand why you have ______ so many problems.

A．run for
B．run over
C．run off
D．run into
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单项选择题
Michael Creuse, ______ help Whymper climbed the Matterhom, was one of the first of the professional guides.
A．who
B．whose
C．that
D．with whose
单项选择题
Our maths teacher is a man whom everyone looks ______.
A．up
B．up to
C．on
D．in
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