【题目】The problems are too complex ________ easily.
A.to be solved
B.to solve
C.solved
D.solving

【答案】A
【解析】考查不定式。句意：这些问题太复杂了，不容易解决。此处是too...to... “太……而不能”句型，problems和solve是被动关系，此处用不定式的被动，故选A。