单项选择题

Don't get down until the train ______.

A．is stopped
B．stopped
C．stops
D．has stopped
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单项选择题
He finds it difficult to ______ himself to the climate here.
A．account
B．accustom
C．apply
D．adopt
单项选择题
There ______ more than one cause contributing to the accident.
A．were
B．was
C．be
D．have been
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