One third of the class _____ agreed to be volunteers to help the aged this vocation.


  1. A.
    are
  2. B.
    is
  3. C.
    has
  4. D.
    have
D
考查主謂一致。本題的主語是One third of the class，其中的class是一個(gè)集體名詞，在本句中指個(gè)體，所以使用復(fù)數(shù)形式。句意：班級里三分之一的學(xué)生同意在這個(gè)假期里做幫助老人的志愿者。
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