With a lot of difficult problems the manager felt a heavy burden taken off his mind.A. s

问题补充：

With a lot of difficult problems , the manager felt a heavy burden taken off his mind.

A. settled

B. to be settled

C. settling

D. to settle

答案：

(答案→)A. settled

B. to be settled

C. settling

D. to settle

解析：本题修饰名词problems是动词settle，表示被解决的问题，表示被动的意思，用过去分词修饰名词作定语，settle的过去分词是settled，故本题选A。