2. 外语
  3. The invention of reinforced concrete, plate glass, and steel in the mid-1800’s (was enabled) architects (to design) and build (e

The invention of reinforced concrete, plate glass, and steel in the mid-1800’s (was enabled) architects (to design) and build (e

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问题 The invention of reinforced concrete, plate glass, and steel in the mid-1800’s (was enabled) architects (to design) and build (extremely tall) constructions, (or) "skyscrapers."
选项 A、was enabled
B、to design
C、extremely tall
D、or
答案A
解析
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