杭州交通信息网王府医院妇科怎么样:一道英语题．请说明原因
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( )24. ---How much are these books?
---You don’t have to ___ . They are free.
A. pay them B. pay for them C. cost them D. spend them
---You don’t have to ___ . They are free.
A. pay them B. pay for them C. cost them D. spend them
)24. ---How much are these books?
---You don’t have to ___ . They are free.
A. pay them B. pay for them C. cost them D. spend them
B
pay for 是词组.
cost 前面要加物品
spend前面加的是人或者是形式主语
B