单项选择题

______you're early you can't be sure of getting a seat.

A．If
B．Unless
C．When
D．Because
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单项选择题
Charles Babbage is generally considered______the first computers.
A．to invent
B．inventing
C．to have invented
D．invented
单项选择题
Her brother______to leave her in the dark room alone when she disobeyed his order.
A．declared
B．threatened
C．warned
D．exclaimed
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