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
There's a man at the reception desk who seems very angry and I think he means ______ trouble.
A．making
B．to make
C．to have made
D．having made
单项选择题
If you don't like to swim, you ______ stay at home.
A．should as well
B．may as well
C．can as well
D．would as well
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