11. ------both safety and reliability have always been primary goals of the railway mechanical engineer.
(A) Railroad history
(B) Railroad history includes
(C) Throughout railroad history
(D) In railroad history there are
ANSWER IS C BUT WHY CANT CHOSE A...THKS
both后已经是具完整的句子了
A中的history与后面的safety等就应该是一个不成逻辑的名词连用错误了
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