Old McDonald gave up smoking for a while but soon to his old way.A. returned 　B. returns

问题补充：

Old McDonald gave up smoking for a while, but soon to his old way.

A. returned

B. returns

C. was returning

D. had returned

答案：

(答案→)A. returned

B. returns

C. was returning

D. had returned

解析：时态题。连词but前后的时态应该基本一致。