He turned down the request of his friend because it wasthe limit of his power.A. beyondB.

问题补充：

He turned down the request of his friend because it wasthe limit of his power.

A. beyond

B. over

C. off

D. above

答案：

(答案→)A. beyond

B. over

C. off

D. above

解析：考查介词，句意：他拒绝了朋友的请求，因为这个请求超出了他的权力范围。Beyond 超出范围，所以选A。