摘要： Mr. Smith began to learn English when he was A. in the 1950’s; in his sixties B. in 1950; in the sixties C. in the 1950’s; over sixty D. both A and C
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Mr. Smith began to learn English _____ when he was ______.
A. in the 1950’s; in his sixties B. in 1950; in the sixties
C. in the 1950’s; over sixty D. both A and C
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