EJ23
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The Wainwright building was designed by _______(1)_______. It is one of the earliest examples of a _______(2)_______.

A(1) Frank Lloyd Wright; (2) ferroconcrete construction
B(1) Joern Uton; (2) cantilever architecture
C(1) Louis Sullivan; (2) steel-framed skyscraper
D(1) Joseph B. Straus; (2) skyscraper