However,taking meaningful measures to conserve the environment requires a lot of time of which it is one of the most important elements for modern people who are occupied with their work and their family.
这是什么句型?
of which指的是 a lot of time还是a lot of time其中的时间?
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你能帮帮他们吗
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下列政权中不以洛阳为都城的是 [ ] A.东周 B.东晋 C.东汉 D.北魏
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