单项选择题

The manager needs an assistant that he can ______ to take care of problems in his absence.

A．count on
B．count in
C．count up
D．count out
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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
单项选择题
The organization had broken no rules, but ______ had it acted responsibly.
A．neither
B．so
C．either
D．both
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