[求助]GWD5 Q1

GWD5-Q1:

So dogged were Frances Perkins’ investigations of the garment industry, and her lobbying for wage and hour reform was persistent, Alfred E. Smith and Franklin D. Roosevelt recruited Perkins to work within the government, rather than as a social worker.

A.      and her lobbying for wage and hour reform was persistent,

B.      and lobbying for wage and hour reform was persistent, so that

C.      her lobbying for wage and hour reform persistent, that

D.      lobbying for wage and hour reform was so persistent,

E.       so persistent her lobbying for wage and hour reform, that

答案是E，这个so……与前面So dogged were Frances ……之间不需要用连词吗？

谢谢