This took place in the( )a,1940 b,1940s c,1940es d,1940th

问题描述:

This took place in the( )a,1940 b,1940s c,1940es d,1940th

选B
in the 1990s 表示在20世纪90年代,可以等于in the 1990's
如果表示在1990年应该是 in 1990
这里有the,应该是in the 1990s