补充 250-20，求教

20.Never before in the history of music have musical superstars been able to command so extraordinary fees of the kind they do today.
(A) so extraordinary fees of the kind they do today
(B) so extraordinary fees as they are today
(C) such extraordinary fees as they do today
(D) such extraordinary fees of the kind today’s have
(E) so extraordinary a fee of the kind they can today

ETS说B里的are错，因为好象是说are command,为什么不可以理解为are able to command?这样不是挺平行的？当然我知道B里的so....fees 错了。