a reply, he decided to send another e-mail.
A. Not receiving
B. Receiving not
C. Not having received
D. Having not received
网友回答
A. Not receiving
B. Receiving not
(答案→)C. Not having received
D. Having not received
解析：考查分词短语做状语。根据句意说明没有收到答复在先，故使用完成式，其否定形式直接在前面加not.句意：因为没有收到回复，他决定再发一份电子邮件。