单项选择题

Mary ______ that the purchase had been a mistake. However, she didn't.

A．ought to acknowledged
B．ought to have acknowledged
C．should acknowledge
D．should be acknowledging
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单项选择题
The young couple ______ with the Whites during their stay in New' York City.
A．pat in
B．pat down
C．pat on
D．put up
单项选择题
The fifth generation computers, with artificial intelligence, ______ and perfected now.
A．developed
B．have developed
C．are being developed
D．will have been developed
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