问题描述：
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
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
问题解答：
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