单选题 "Maria has blisters in her boots. "
"She ______ walking such a long distance. "
A. was used not to B. used to C. is not used to D. did not used to

【正确答案】 C

【答案解析】[试题分析] 此题考查动词短语的用法。
[详细解答] be used to + V-ing分词，意为“习惯于……”，V-ing分词作动词短语的宾语。used to+动词原形，意为“过去常常……”。因此C为正确答案。