问题补充：
in the leg made it impossible for me to walk as fast as usual.
A. Having injured
B. Being injured
C. To be injured
D. injured
答案：
A. Having injured
(答案→)B. Being injured
C. To be injured
D. injured
解析：这里用动名词作主语，必须用动名词的被动形式，故选B。
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