单项选择题

Tom could hardly ______ his excitement as he knew that he had made a real discovery.

A．conceal
B．reveal
C．show
D．discover
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单项选择题
He was seriously injured in a car accident, which was ______ to faulty brakes.
A．attributed
B．contributed
C．blamed
D．applied
单项选择题
As we can no longer wait for the delivery of our order, we have to ______ it.
A．postpone
B．refuse
C．accept
D．cancel
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