Mr．Smith__working till he was seventy ye

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问题 Mr．Smith__working till he was seventy years old.A.kept upB.kept onC.kept toD.kept out

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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英语专升本

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