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

The organization had broken no rules, but ______ had it acted responsibly.

A．neither
B．so
C．either
D．both

单项选择题

At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly ______ to another subject.

A．committed
B．switched
C．favoured
D．transferred

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