Richard turned off the computer after he had finished___the email

问题描述:

Richard turned off the computer after he had finished___the email
A.write B.to write C.writing D.wrote

选C
finish doing sth是完成在做的事情.
其他形式都不对.
特别强调,没有finish to do sth 这个结构.因为to do sth表示将要做,目的做某事,因此不可能去完成还没有做的事情.