Chi tiết câu hỏi

Choose the sentence which is has the closest meaning the given one.
He didn’t know how to swim until he was 30 years old.
A. Only when he was 30 years old did he know how to swim.
B. At the age of 30, he didn’t know how to swim.
C. By the time he was 30 years old, he had known how to swim.
D. He knew how to swim as soon as he was 30 years old.


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