SAT的一道writing的题
BerthaLammereceivedherengineeringdegreein1893,whichshethenspecializedprofessionallyinthedesignofmotorsandgenerators.
(A)1893,whichshethenspecializedprofessionally
(B)1893,specializingasherprofession
(C)1893and,asaprofessional,specialized
(D)1893,then,foraprofession,specializes
(E)1893,shehasspecializedasaprofessional