there were only five soldiers left at the front they went on fighting.A. Because;soB. If

问题补充：

there were only five soldiers left at the front, they went on fighting.

A. Because;so

B. If;and

C. Though;but

D. Though;/

答案：

A. Because;so

B. If;and

C. Though;but

(答案→)D. Though;/

解析： 本题的含义为虽然在前面只剩下5名战士，但是他们继续斗争，表示让步应用though，和转折连词but只能使用一个，故本题选D。