developed ingenious orthopedic bracespioneered in treating skull fracturesand supervised the first use of Aureomycin on human patients.三个是并列的,都是Louis T. Wright, a surgeon所做的事。选C的话,which pioneered in treating skull fractures是形容braces的,后面就不能再接and supervised the first use of Aureomycin on human patients这句话了...