In order to find the missing boy, villagers along with his mother _________ all they can over the past five hours. --优优班--学霸训练营

In order to find the missing boy, villagers along with his mother _________ all they can over the past five hours.

A．has done

B．are doing

C．had done

D．have been doing

【考点】现在完成进行时,语法一致原则

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难度：较难

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