Question

请问为什么选C？谢谢

Who are you waiting for? -- _____ the man wounded in the left leg.
A. The doctor will operate on B. Tie nurse to be looked after
C. The doctor to operate on D. His brother got 答案：C

Answer 1

问题问的的是who，答案自然必须是一个人。
如果选A或D，含义均是某人做某事的主谓成分完整句子，文不对题。
如果选B，“be looked after”的被动式从含义上就错了，变成了被腿受伤的人照顾的护士；从语法上也错了，应该是“be looked after by ”
只有C，"to operate on the man"这个不定式，作为后置定语修饰"the doctor"。翻译为，给左腿受伤的人做手术的医生。

Answer 2

后置定语吧。