In fact, _______ one cause that leads to the problem.
A．cattle isB．cattle areC．cattles areD．the cattles are
B
  cattle(牲畜，牛)為集合名詞，盡管它不帶復(fù)數(shù)詞尾-s，卻永遠表示復(fù)數(shù)意義，若用作主語，謂語要用復(fù)數(shù)
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