please help with toefl question. which one is correct, why?

iamliar (Wu_Zheng)
1. The Woolworth Building in New York was the highest in Americawhen _______ in 1943 and wasfamous for its use of Gothicdecorative detail.
(A) built
(B) it built
(C) was built
(D) built it
(#305432@0)
2001-12-20 -05:00

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