he had broken the record he would be a world-famous runner now.A. When B. BecauseC. IfD.

问题补充：

he had broken the record, he would be a world-famous runner now.

A. When

B. Because

C. If

D. Though

答案：

A. When

B. Because

(答案→)C. If

D. Though

解析：考查连词。根据题中已经用了过去事实相反的虚拟语气，故用if来引导，选C。