i think the work didn't

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cost (物)值...,花费
我认为这个工作没有花费太多（或,成本不高）.
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pay 的意思是“支付、付出”,主语通常是人,因为支付薪资或付出努力的是人啊
Everyone,pay attention please!
I will pay for your work.
======以下答案可供参考======
供参考答案1:
C A的主语是It,B的主语是sb,
供参考答案2:
选A~供参考答案3:
答案是 a 表示花费时cost 的主语是物
spent 的主语是人
take 的主语是 it take sb sometime to do sth.
pay 用 pay for 前人后物。
供参考答案4:
sth costs sb some money
sb spends some money on sth/in doing sth
It takes sb some money/time to do sth
sb+pay for+sth