问题
选择题
I'd like to know _____ Chinese. [ ]
A. when he began to learn
B. when did he begin to learn
C. when did he begin learning
D. for how long he began to learn
答案
答案：A
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I'd like to know _____ Chinese. [ ]
A. when he began to learn
B. when did he begin to learn
C. when did he begin learning
D. for how long he began to learn
答案：A