一患儿因脊髓灰质炎而入院治疗，治愈后发现一侧下肢肌肉萎缩，该患儿发生了哪种类型的萎缩分析其原因，并说明还有哪些病理性萎缩的类型
参考答案：
They both have ______ homework to do, so they may be ______ busy doing it now.[ ]
A. much too; too much
B. too much; much too
C. so many; much too
D. so much; too much
)
