No matter how frequently the boy was always in low spirits.A. encouragedB. encouragingC.

问题补充：

No matter how frequently , the boy was always in low spirits.

A. encouraged

B. encouraging

C. to be encouraged

D. was encouraged

答案：

(答案→)A. encouraged

B. encouraging

C. to be encouraged

D. was encouraged

解析：此题为让步状语从句的省略，the boy与encourage之间是动宾关系，因此选A。