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
His illness was ______ to overwork.
A．responsible
B．reason
C．due
D．because
单项选择题
______ is a great virtue.
A．The wisdom
B．Wisdom
C．Wisdoms
D．A wisdom
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