(Until) the George Washington Bridge (was built), modern suspension bridges were stiffened with steel trusses and beams to (limi

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问题 (Until) the George Washington Bridge (was built), modern suspension bridges were stiffened with steel trusses and beams to (limited) their motion (in traffic) and wind.

选项 A、Until
B、was built
C、limited
D、in traffic

答案C

解析
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