Diamond, , is the hardest of all materials.A. like we know B. since we knowC. we knowD. as

发布时间：2020-08-16 16:18:46

Diamond,     , is the hardest of all materials.
A. like we know
B. since we know
C. we know
D. as we know

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A. like we know
B. since we know
C. we know
(答案→)D. as we know
解析：定语从句题。先行词是整个句子时关系词只能用as，所以要选D。 正如我们知道的那样钻石是所有材料中最硬的。
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