单项选择题

It is unfortunate that, owing to lack of money, these experiments must now be ______ before the objective has been achieved.

A．transferred
B．testified
C．terminated
D．transformed
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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
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
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