单选题
She ______ working till he was seventy (七十) years old.
A、
[A] kept on
B、
[B] kept up
C、
[C] followed
【正确答案】
A
【答案解析】
[A]kept on继续下去。[B]kept up维护，保持下去。[C]followed跟随。由题意，应该选A。
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