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Doctors asked us to take our temperature _______ hour during SARS(非典).


  1. A.
    three time one
  2. B.
    twice an
  3. C.
    one time a
  4. D.
    two times a
B
hour为元音音素开头,冠词须用an;别外,time意为“次数”,应注意单复数。
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