After so many hardships the scientist his motherland at last.A. set on his footB. set foo

问题补充：

After so many hardships, the scientist his motherland at last.

A. set on his foot

B. set foot on

C. set feet on

D. set his feet on

答案：

A. set on his foot

(答案→)B. set foot on

C. set feet on

D. set his feet on

解析：考查固定短语。set foot on踏上。 在经历了这么多艰辛之后，这个科学家终于踏上了祖国的土地。