In order to find the missing child，villagers ________ all they can over the past five hours.(2012·安徽)
| A．did | B．do |
| C．had done | D．have been doing |
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In order to find the missing child，villagers ________ all they can over the past five hours.(2012·安徽)
| A．did | B．do |
| C．had done | D．have been doing |
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