With a lot of difficult problems the manager felt worried all the time.A. to settleB. se

问题补充：

With a lot of difficult problems , the manager felt worried all the time.

A. to settle

B. settling

C. settled

D. being settled

答案：

(答案→)A. to settle

B. settling

C. settled

D. being settled

解析：不定式后的动词与所修饰的名词构成动宾关系，一般不用被动形式。而题干中这些问题还未解决，故用不定式表示。