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the diamond mine ____ accidentally by a little boy when he w

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the diamond mine ____ accidentally by a little boy when he was playing hide
A,discovered
B,was discovered
C,has been discovered
D,would discover
是不是选A?请详细解析,谢谢!
the diamond mine ____ accidentally by a little boy when he w
选B
钻石矿是被发现的,要用被动语态.而且是过去的事情,过去时.
那个钻石矿是被一个小男孩儿子玩藏猫猫时发现的.