As the saying goes one is never too old to learn. After he he will devote himself to ga

问题补充：

As the saying goes, one is never too old to learn. After he , he will devote himself to gardening.

A. retired

B. has retired

C. will retire

D. had retired

答案：

A. retired

(答案→)B. has retired

C. will retire

D. had retired

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