问题描述：
英语18.________ a reply ,he decided to write again.
18.________ a reply ,he decided to write again.
a.Not receiving b.Receiving not c.Not having received d.Having not received
为什么
18.________ a reply ,he decided to write again.
a.Not receiving b.Receiving not c.Not having received d.Having not received
为什么
问题解答：
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