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Diamond, _________, is the hardest of all materials.
A．like we know B．since we knowC．we knowD．a(chǎn)s we know
D
定語從句題。先行詞是整個句子時關(guān)系詞只能用as，所以要選D。 正如我們知道的那樣鉆石是所有材料中最硬的。
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