Have you finished ( ) your letters.A.writing B.to write C.write D.wrote 要写原因

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Have you finished ( ) your letters.A.writing B.to write C.write D.wrote 要写原因
Have you finished ( ) your letters.A.writing B.to write C.write D.wrote 要写原因

Have you finished ( ) your letters.A.writing B.to write C.write D.wrote 要写原因
A
finish doing 完成某事

A. writing
这里要用作动词,因为writing letters 是个名词,表示“写信”这个名词。