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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There （） more than one cause contributing to the accident.

A．were
B．was
C．be
D．have been
单项选择题
All students are （） to the rules of the school.

A．obeying
B．object
C．subject
D．according
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