______ to use crutches for six months severely limited Mr. Locke's ability t...

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问题 ______ to use crutches for six months severely limited Mr. Locke's ability to work in the shipping facility.

选项 A. Has
B. Have
C. Having
D. Has had

答案C

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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