The student----- has won the first prize in the English competition is a 16-year-old boy.

问题描述:

The student----- has won the first prize in the English competition is a 16-year-old boy.
a.不填B,he,c,whom,d,who

D 该句话主语为The student is a 16-year-old boy.从句中缺主语,因此只能用who代替.