—Why does the lake smell terrible?
—Because large quantities of water _____.
A．have polluted.B．is being polluted.
C．has been polluted.D．have been polluted.
D

試題分析：從問句和答語可知說的是湖的現(xiàn)在的情況，又因為強調(diào)污染對湖所產(chǎn)生了一定的結(jié)果和影響，故在C，D中選擇正確答案。由于主語是quantities，謂語動詞要用復(fù)數(shù)。故選D。
點評：熟練掌握現(xiàn)在完成時和名詞的主謂一致中一些需要記憶的知識點。
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