Silicon, a nonmetallic element, is______ abundant element in Earth’s crust.A、sec

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问题 Silicon, a nonmetallic element, is______ abundant element in Earth’s crust.

选项 A、second more than
B、more second the
C、second most of
D、the second most

答案 D

解析 The second most correctly completes the superlative structure the second most abundant.

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