I understand your viewpoint I don’t agree with it.A. UnlessB. SinceC. BeforeD. While

问题补充：

I understand your viewpoint, I don’t agree with it.

A. Unless

B. Since

C. Before

D. While

答案：

A. Unless

B. Since

C. Before

(答案→)D. While

解析：考查连词用法。A除非…；B既然；C在…之前；D当…时；尽管；句意：尽管我理解你的观点，但是我并不同意。根据句意说明while表示尽管。故D正确。