单项选择题

The computational speed of computers ______ doubled in the last decade.

A．have
B．has
C．will
D．would
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单项选择题
Can you give me ______ details, please
A．lot
B．less
C．father
D．further
单项选择题
—I drove from New York yesterday. —What time ______ Boston
A．did you reach
B．have you reached
C．you reached
D．you have reached
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