the diamond mine ____ accidentally by a little boy when he was playing hideA,discoveredB,was discoveredC,has been discoveredD,would discover是不是选A?请详细解析,谢谢!

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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!

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.

B,was discovered
钻石矿被发现,用被动
发现在过去,用一般过去时

选B。 discover sth ,这里不过采用被动语态而已 ,排D除A、D,根据后半句时态,排除C,正确答案B。
The diamond mine was discovered accidentally by a little boy when he was playing hide.
那个钻石矿是被一个小男孩儿子玩藏猫猫时偶然发现的。
望采纳,祝开心~!