First (reported by) Spanish explorers in 1796, (the asphalt) in California’s La Brea Tar Pit was mined (commercial) for (many) y

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问题 First (reported by) Spanish explorers in 1796, (the asphalt) in California’s La Brea Tar Pit was mined (commercial) for (many) years.

选项 A、reported by
B、the asphalt
C、commercial
D、many

答案C

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