It was the training _____ he had as a yo
题型：选择题
问题：
It was the training _____ he had as a young man _____ made him such a good engineer. [ ]
A. what; that
B. that; which
C. which; that
D. that; what
It was the training _____ he had as a young man _____ made him such a good engineer. [ ]
A. what; that
B. that; which
C. which; that
D. that; what