问题
选择题
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
答案
答案：C
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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
答案：C