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Richard turned off the computer after he had finished___the

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