LZM 时态、语态、语气 习题 E4-14 求教

As sales of cars and light trucks made in North Amarica were declining 13.6 percent in late February, many analysts conclude that evidence of recovering automotive market remains slight.

A) As sales of cars and light trucks made in North Amarica were declining 13.6 percent in late February, many analysts conclude

B) Since sales of cars and light trucks made in North Amarica declined 13.6 percent in late February, and many analysts conclude

C) With sales of cars and light trucks made in North Amarica declining 13.6 percent in late February, with many analysts concluding

D) Because sales of cars and light trucks made in North Amarica declined 13.6 percent in late February, many analysts concluded

E) Because of sales of cars and light trucks made in North Amarica declining 13.6 percent in late February, therefore, many analysts concluded

答案选 D

但是未画线部分有个 remains, 似乎时态不是过去时，求教各位DX，谢谢！