he was very tired he didnt stop to have a rest.A. ButB. AsC. BecauseD. Although

问题补充：

he was very tired, he didn stop to have a rest.

A. But

B. As

C. Because

D. Although

答案：

A. But

B. As

C. Because

(答案→)D. Although

解析：根据题干，本句的意思是：尽管他很累，但他并没有停下来休息。But“但是”，as“因为”“作为”，because“因为”，although“尽管”。故本题选D。