The smog arrived in the Yangtze River Delta region on Nov．30，_________the air quality in 1 2 cities out of 25 was rated as severely polluted by Dec．1．
A．whereB．whenC．whichD．what
A

試題分析：句意：霧霾在11月30號(hào)到達(dá)長(zhǎng)三角區(qū)域那里25個(gè)城市中有12個(gè)被列為嚴(yán)重污染。這里用了定語從句，先行詞是the Yangtze River Delta region，定語從句中不缺主賓表，缺少的是地點(diǎn)狀語，所以用where引導(dǎo)定語從句，選A。
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