With a lot of difficult problems the manager felt worried all the time.A. settled B. to b

问题补充：

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

A. settled

B. to be settled

C. settling

D. to settle

答案：

A. settled

B. to be settled

C. settling

(答案→)D. to settle

解析：考查非谓语动词。本题考查with的复合结构，根据句意可知难题未被解决，故用不定式作宾语补足语，选D。