A-A+

Mr. Smith ______working till he was seventy ye

2022-08-07 18:38:53 问答库阅读 182 次

问题详情

Mr. Smith ______working till he was seventy years old.
A．kept up
B．kept on
C．kept to
D．kept out请帮忙给出正确答案和分析，谢谢！

正确答案：B
解析：keep on doing sth．意为“坚持做某事”。