It took us _______ to finish the new research project.
| A．three hour and a half | B．three and a half hour |
| C．three and half hours | D．three and a half hours |
It took us _______ to finish the new research project.
| A．three hour and a half | B．three and a half hour |
| C．three and half hours | D．three and a half hours |
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