单项选择题

Marbles ______ once not confined to children.

A．was
B．is
C．were
D．are
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单项选择题
Neither my classmates nor I ______ sure that all of us will be able to pass this exam.
A．am
B．is
C．are
D．be
单项选择题
If only I ______ the petrol before we started out. Now I have to push the car to the road side.
A．should check
B．have checked
C．had checked
D．checked
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