138. As sales of cars and light trucks made in North America were declining 13.6 percent in late February, many analysts conclude that evidence of a recovering automotive market remains slight. (A) As sales of cars and light trucks made in North America were declining 13.6 percent in late February, many analysts conclude (B) Since sales of cars and light trucks made in North America declined 13.6 percent in late February, and many analysts conclude (C) With sales of cars and light trucks made in North America declining 13.6 percent in late February, with many analysts concluding (D) Because sales of cars and light trucks made in North America declined 13.6 percent in late February, many analysts concluded (E) Because of sales of cars and light trucks made in North America declining 13.6 percent in late February, therefore, many analysts concluded D 为什么从句中用remains?因为是调查报告？
