He ______ working till he was seventy years old.A、kept upB、kept onC、kept toD、

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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 本题测试keep动词短语的用法。keep up:持续, keep on,继续做某事;keep to;遵循,不偏离;keep out:留在外面。根据句意只有B为正确选项。句子的意思是:“他一直工作到七十岁。”
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