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  3. Mr. Smith ______ working till he was seventy years old.

Mr. Smith ______ working till he was seventy years old.

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问题 Mr. Smith ______ working till he was seventy years old.
选项 A、kept up
B、kept on
C、kept to
D、kept out
答案B
解析 keep on doing sth．意为“坚持做某事”。
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