问题
选择题
____ 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
答案
答案：C
本题考查非谓语动词。注意现在分词可以表示原因，现在分词的否定式是Not having，而不是having not。look forward to doing sth希望做某事。