When he was 20,he left school and went t
题型:选择题
问题:
When he was 20, he left school and went to Beijing, ________he made great progress and became
an engineer.[ ]
A. what
B. which
C. where
D. when
When he was 20, he left school and went to Beijing, ________he made great progress and became
an engineer.[ ]
A. what
B. which
C. where
D. when