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people are trying to stop pollution from cars ,one way is to

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people are trying to stop pollution from cars ,one way is to make green cars .but it ()much to
make these cars.A takes B spends C pays D costs.要说为什么?
people are trying to stop pollution from cars ,one way is to
D costs
人们尝消除汽车带来的污染,其中一种方法就是制造绿色环保的汽车,但是制造这种车的成本太高.spend on sth./(in)doing sth.不接to ,pay 后面接for ,排除B和C.这里想表达的意思是 成本(花费)太高.所以选D.
再问: swimming across the river takes about 10 minutes.请问这一句里, takes 前是否省略了it ?
再答: 没有 swimming across the river 这个就是主语
再问: it takes sb sometime/money to do sth. take不都是这样用的吗?它能单用吗
再答: 可以啊 表示 花费 的意思 游到河对面大约花费了10分钟的时间