a letter from her parents, Lily is now looking forward to from them.
A Having not received; hear B. Not received; hear
C. Not having received; hearing D. Receiving not; hearing
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解析：考查分词做状语和动名词用法。第一空中的动词receive与句子主语Lily构成主动关系，故使用现在分词的形式，因为没有收到来信是在谓语动词之前就发生的事情，所以使用完成式，起否定式是在前面直接加not；第二空前的to是介词，后面要接动名词的形式。句意：因为没有收到父母的来信，Lily现在期待着能够收到父母的来信。故C正确、