作者recover (Years Bring Wisdom)
看板Language
标题[文法] 请问
时间Wed Feb 13 20:30:36 2008
The likelihood of toxic pollutants and other carcinogens entering
the reservoir's filtration system "is" worrying many of the
district's residents who have drunk unboiled tap water recently.
请问上述为什麽要用is而不是are呢?
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1F：推 quasivitric:likelihood 02/13 21:14