I walked too much yesterday and (  ) are still aching now.

A. my leg's muscles 

B. my muscles of leg

C. my leg muscels

D. my muscles of the leg

答案C正确，没有问题。

如果把D改成 my muscles of two legs 也对吗？还是要改成 my muscles of the legs ? my muscles of the two legs ? 要怎么改才正确呢？ 谢谢！