og-170

170. Although early soap operas were first aired on evening radio in the 1920's, they had moved to the daytime hours of the 1930's when the evening schedule became crowded with comedians and variety shows.

(A)            were first aired on evening radio in the 1920's, they had moved to the daytime hours of the 1930's

(B)            were first aired on evening radio in the 1920's, they were moved to the daytime hours in the 1930's

(C)            were aired first on evening radio in the 1920's, moving to the daytime hours in the 1930's

(D)            were aired first in the evening on 1920's radio, they moved to the daytime hours of the 1930's

(E)            aired on evening radio first in the 1920's, they were moved to the 1930's in the daytime hours

答案是B,有一个疑问,although从句中的1920年是在主句时间1930年之前,是"过去的过去",为什么不用过去完成时呢?

谢谢NN指点!

可是B的时间状语是in the 1920's, 不是before they were moved，before the 1920's, by the 1920's。

in the 1920's是表示具体时间的时间状语，完成时是不能和表示具体时间的时间状语连用的。