Question

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

1. A.
   to settle
2. B.
   settling
3. C.
   settled
4. D.
   being settled

Answer 1

A
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。