is known to us，there is a close connection between smog and pollution.（ ）
【考點(diǎn)】關(guān)系代詞as引導(dǎo)非限制性定語從句．
【答案】D
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/12/16 5:0:1組卷：38引用：2難度：0.7
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