2. 外语
  3. He______working till he was seventy years old.

He______working till he was seventy years old.

admin2015-04-28  18
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 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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成人本科学位英语

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