That is a very difficult problem. It's beyond my to work it out.

That is a very difficult problem. It's beyond my to work it out.

A.strength

B.force

C.power

D.right

答案及解析： C

解析：

power有“力量、能力”之意，beyond one's power意为“在能力之外”；

而strength意为“力气，力量”；

force意为“迫使、武力”；

right意为“权力”，因此只有C项才符合题干的意思。