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一道英语选择题不懂We cannot accurately predict how much carbon dioxid

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一道英语选择题不懂
We cannot accurately predict how much carbon dioxide _____by factories will remain permanently in the air.
答案是released.为什么不是being released?不是被动语态吗?水讲得详细分给谁
一道英语选择题不懂We cannot accurately predict how much carbon dioxid
e released == Vpp 是被动语态
which is/was 已经省略