The old sick lady entered the hospital, ______ her two sons.
| A．to support | B．supporting | C．supported by | D．having supported |
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_____ we can see, we can’t get very far in this project without her help.
| A．As long as | B．So long as | C．So far | D．As far as |
More than one company ___ the new design to market only to see it quickly denied by those who couldn’t wear them.
| A．has taken | B．has been taken | C．have taken | D．have been taken |
During our stay in London, the guide book ___ a great help. We all had a wonderful time.
A. behaved B conducted C. served D. proved
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