单项选择题

It is still not clear what ______ a series of argument between them.

A．contributed
B．marked
C．ignited
D．triggered
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单项选择题
Because of a recent obstacle in production, sales have dropped and accordingly profits have ______.
A．declined
B．increased
C．broken
D．promoted
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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