I am sure you will make it in the end you have worked so hard.A. soB. althoughC. butD. be

问题补充：

I am sure you will make it in the end you have worked so hard.

A. so

B. although

C. but

D. because

答案：

A. so

B. although

C. but

(答案→)D. because

解析：此题考查连词，表示因果关系故用because。