单选题 ______ to use crutches for six months severely limited Mr. Locke's ability to work in the shipping facility.
  • A. Has
  • B. Have
  • C. Having
  • D. Has had


【正确答案】 C
【答案解析】[解析] “______ to use crutches for six months”作句子的主语，所以应该用动名词短语作主语。故本题正确答案为C。