Now people have come to realize ________ harmful pollution is.
A．that whatB．itC．that howD．how
D

試題分析：句意：現(xiàn)在人們逐漸的認(rèn)識(shí)到污染多么的有害。在賓語(yǔ)從句中連接詞不能同時(shí)應(yīng)用，how用來(lái)修飾形容詞的程度，故選D。
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