问题标题：
【hewrote____lettertohisparentsyeaterday.hewrote____lettertohispa.a800wordsb.an800-wordc.an800-word'sd.a800-word顺便说明为什么.】
问题描述：
hewrote____lettertohisparentsyeaterday.hewrote____lettertohisp
a.a800words
b.an800-word
c.an800-word's
d.a800-word
顺便说明为什么.
李丽娜回答：
d.a800-word
aletter中间加800-word做修饰定语
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