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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单项选择题
So many students ______ the teacher threw the textbook in a fit of anger.
A．were absent-minded
B．be absent-minded
C．been absent-minded
D．being absent-minded
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单项选择题
There are some faults which men readily ______, but others not so readily.
A．acknowledge
B．admit
C．confess
D．concede
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