some problems have arisen in the process we are confident that we can handle them.A. AsB

问题补充：

some problems have arisen in the process, we are confident that we can handle them.

A. As

B. If

C. While

D. Since

答案：

A. As

B. If

(答案→)C. While

D. Since

解析：考查状语从句。As 和 While 都有“虽然”含义都表示让步但是As从句要倒装而 While不用。虽然在进程中出现了问题但是我们相信我们能处理它们。