He______working till he was seventy years old.A、kept upB、kept onC、kept toD、ke

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问题 He______working till he was seventy years old.

选项 A、kept up
B、kept on
C、kept to
D、kept out

答案 B

解析本题考查动词短语。keep on doing“继续”；keep up“保持”；keep to“遵循”；keep out“使在外面”。句意：他一直工作到70岁。

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