When he came back he found his house was crowded with friend

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When he came back he found his house was crowded with friends ...下列选择哪一项?
When he came back he found his house was crowded with friends eager to congratulate him on his ( )
A been chosen for the expedition
B having been chosen for the expedition
C being had chosen for the expedition
为什么选B不选A或C,这句话不是被动语态吗?

这位网友说得很对,是被动,只是还有一点需要考虑进来：括号前面是一个物主代词his ,物主代词后面一定是一个名词性的词（组）,即使是动词也要变成动名词（ing形式）；也就是说,A首先就被排除了；从B和C中选一个,因为时态是“被选中了”,是完成,所以C也被淘汰了,最终选B.
再问：但现在分词的被动式不是being+过去分词吗？
再答：这位网友，咱们这样来推理吧，这里是说“已经被选中了”，这里面有两层意思：完成 + 被动，同意吗？ “现在完成+ 被动”的说法是：have been done 同意吗？变成“动名词”，应该是having been done.
再问：我明白了，谢谢耐心解答！
再答：不谢，很高兴能够对你有所帮助。祝进步、快乐！

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