When he was 20,he left school and went to Beijing,________he made great progress and becamean engine

题目简介

When he was 20,he left school and went to Beijing,________he made great progress and becamean engine

题目详情

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
题型:单选题难度:中档来源:同步题

答案

C

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