觉得c没有问题, 参见 pp-test-1-93 Copper was the first metal used by humans and is second only to iron into its utility through the ages. (C) pp-test-1-90 A major Canadian city, Montreal is second only to Paris as the most largest French-speaking city in the world.(D) 2题中be second only to sth or splc 均对 prove pp-test-2-68 Oak trees furnish more timber annually in the United States than any of other broad-leaved tree and are second only to conifers in total lumber production. (B)
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