I admit that there are quite a few problems I don't agree that they cannot be solved. A.

问题补充：

I admit that there are quite a few problems, I don agree that they cannot be solved.

A. Supposing

B. Since

C. While

D. As

答案：

A. Supposing

B. Since

(答案→)C. While

D. As

解析：句意：尽管我承认有很多问题，但是我认为他们不是不能解决的。A. Supposing假设；B. Since自从、因为；C. While当……时、尽管；D. As因为、随着、作为。由句意可知选C。

考点: 考查连词的用法。