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— Good morning.How much should I pay for these books _______

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— Good morning.How much should I pay for these books __________ to Alabama?
— Hmm,about ten dollars.
A.to be sent B.being sent C.sent D.having been sent
— Good morning.How much should I pay for these books _______
选D having done 是发生在谓语动词pay for之前 这里的书是被送去的,所以用having been sent
再问: 是怎么解释的,谢谢