Diamond is ______ natural substance which is known.
Diamond is ______ natural substance which is known.
A、hardest
B、one of hardest
C、harder
D、the hardest
【正确答案】：D
【题目解析】：句意：钻石是已知的最坚硬的天然物质。最高级表达方法 the +形容词最高级形式
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