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。
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