Every means _________, but none proved __________.
| A．have tried; a success |
| B．have been tried; successful |
| C．has tried; to be successful |
| D．has been tried; successful |
相关试题
Jack always sleeps late on Sundays. I’m sure he when we get to his home.
| A．is still sleeping | B．is to be sleeping |
| C．will still be sleeping | D．will have been sleeping |
Unitl tens of years ago, most zoos in such a way—animals in one area and birds in another.
| A．were organized | B．had organized |
| C．will organize | D．have been organized |
It is well known 
that the Internet will let people have to huge amounts of information from their own homes.
| A．appeal | B．attention | C．access | D．approach |
This summer she took a training course, which was to help people develop their reading skills.
| A．operated | B．devoted | C．designed | D．furnished |
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