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被动语态to be与being

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被动语态to be与being
being 正在进行,to be将来要做
1.they insisted on the design being finished tomorrow.
a.being finished b.to be finished
为什么B是错的?
2.The children went there to watch the iron tower__
a.being ecrected b be erected
选什么?为什么?
1,being finished,因为insist on+doing 是固定搭配
2,being ecrected,因为是被动语态