[文法] 請問這句子的文法架構

[ele1325 (ele1325)]

128. ---- average home prices down over eight percent in 2008,
     legislators are particularly worried about current economic trends.
     (A) When (B) Just as (C) Above  (D) With

Ans: (D)

書中解釋down是動詞…所以這是兩個子句嗎??
如果是兩個字句，怎是用介系詞??煩請鄉民解惑~~謝謝~~

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→ dunchee:這本書可以丟了，因為光是你的程度都比他強
→ dunchee:http://www.learnersdictionary.com/search/down
→ dunchee:選 2 down(adjective)
推 pelicanper:哪一本書?
→ ele1325:國際學村 多益新題庫解析 全新試題版
→ pptuser:when或Just as子句要有動詞. Above不通.