单选题 初二英语--could you tell me when Confucius began to teach?--Sure, he began to teach when he was_______.A. at thirty B. more than thirty C. thirty D. at the age of thirty

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单选题 初二英语
--could you tell me when Confucius began to teach?
--Sure, he began to teach when he was_______.
A. at thirty B. more than thirty C. thirty D. at the age of thirty

应该选C 选项D是介词短语可单独做状语 用在这里不合适

D at the age of thirty 意思是 在三十岁的时候
at one's thirties 在某人三十多岁的时候

C

选C,对的