Mr. White had no money for the taxi so he had to home.A. walk back toB. walked back toC.

问题补充：

Mr. White had no money for the taxi, so he had to home.

A. walk back to

B. walked back to

C. walks back

D. walk back

答案：

A. walk back to

B. walked back to

C. walks back

(答案→)D. walk back

解析：walk back to sp，表示步行去某地，但是home为副词，因此to去掉，故选D