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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单项选择题
All students are （） to the rules of the school.

A．obeying
B．object
C．subject
D．according
单项选择题
By next week the new regulations （）.

A．will introduce
B．are to introduce
C．are to be introduced
D．will have introduced
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