It took us ________ to finish the experiment on the monkey
| A．an hour or two | B．one or two hour |
| C．one and a half hour’s time | D．one hour and a half time |
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It took us ________ to finish the experiment on the monkey
| A．an hour or two | B．one or two hour |
| C．one and a half hour’s time | D．one hour and a half time |
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