单项选择题

"If we fail to act now," said Tom, "we'll find ourselves （）this later on."

A．pay back
B．pay for
C．pay up
D．pay off

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The fifth generation computers, with artificial intelligence, and perfected now.
A．developed
B．have developed
C．are being developed
D．will have been developed
单项选择题
Physics is the present day equivalent of ______ used to be called natural philosophy, from most of present day science arose.
A．which, what
B．that, which
C．what, which
D．what, that
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