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
Careful surveys have indicated that as many as 50 percent of patient do not take drags ______ directed.
[A] what
[B] so
[C] which
[D] as
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