单项选择题
A．overcomes B．will be overcome C．is overcome D．has overcome
We got down to business as soon as we（）each other. A．ha...
单项选择题We got down to business as soon as we（）each other.
A．had introduced to B．had been introduced to C．had introduced by D．had been introduced by
The fifth generation computers, with artificial intelli...
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
We should keep ourselves（）of the latest developments. A...
单项选择题We should keep ourselves（）of the latest developments.
A．informing B．informed C．to inform D．inform
