Chinese public buildings erected under a construction code of the Sung dynasty have withstood earthquakes well because the white cedar used has four times the tensile strength of steel and the timber frame, incorporating many joints and few nails, is flexible.
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Aused has four times the tensile strength of steel and the timber frame, incorporating
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Bused in them has four times the tensile strength of steel has and the timber frame, incorporating
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Cthat was used in them has four times the tensile strength steel has, and the timber frame, incorporating
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Dthat was used has four times as much tensile strength as steel, and the timber frame incorporates
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Ethat was used has four times the tensile strength steel does, and the timber frame incorporates
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正确答案: A