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
Do open the door, ______ you
[A] can't
[B] don't
[C] wouldn't
[D] won't
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 ED] having made
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