________there are a large number of chemical factories, the air is likely to be polluted.
A．WhereB．That　　　　C．ThoughD．As
A

試題分析：考查狀語從句。句意：在有很多化工廠的地方，空氣很可能被污染。這里的where在句中做狀語，引導的是地點狀語從句。That不能引導狀語從句，though引導的是讓步狀語從句。故A正確。
點評：狀語從句是考查主要是根據(jù)句子的意思和上下文的串聯(lián)，考查的主要內容也是連接詞的考查，連接副詞在句中做狀語，連接代詞在句中做主語，賓語等成分。
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