47.Jack would rather spend time complaining than ---- the pr

47.Jack would rather spend time complaining than ____ the problem by himself.
A.solve
B.solved
C.solves
D.to solve
请分析考点及解题思路（对于高手来讲这道题很容易,可对我却是有点难,请回答下其他答案为何不可?）