SAT 的一道writing的题Bertha Lamme received her engineering degree in 1893,which she then specialized professionally in the design of motors and generators.(A) 1893,which she then specialized professionally (B) 1893,specializing as her profession

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SAT 的一道writing的题Bertha Lamme received her engineering degree in 1893,which she then specialized professionally in the design of motors and generators.(A) 1893,which she then specialized professionally (B) 1893,specializing as her profession

SAT 的一道writing的题Bertha Lamme received her engineering degree in 1893,which she then specialized professionally in the design of motors and generators.(A) 1893,which she then specialized professionally (B) 1893,specializing as her profession
SAT 的一道writing的题
Bertha Lamme received her engineering degree in 1893,which she then specialized professionally in the design of motors and generators.
(A) 1893,which she then specialized professionally
(B) 1893,specializing as her profession
(C) 1893 and,as a professional,specialized
(D) 1893,then,for a profession,specializes
(E) 1893,she has specialized as a professional

SAT 的一道writing的题Bertha Lamme received her engineering degree in 1893,which she then specialized professionally in the design of motors and generators.(A) 1893,which she then specialized professionally (B) 1893,specializing as her profession
C
(A): the original has an extra 'which'. This 'which' has no reference and is not necessary.
(B): the two actions 'received' and 'specialized' are clearly in sequence and thus the 2nd verb 'specialized' should not be turned into a present participial clause.
(C): 'specialized' and 'received' are in sync and both are in past tense. The 'as a professional' is a parenthetical phrase.
(D): 'specializes' is present tense, disagreeing with the past tense 'received'
(E): This creates a run-on sentence.
我是美籍华人英语老师, 这样解释明白吗?