It is a common practice in the USA that one needs to make a(n) _    __ before seeing a doctor.


  1. A.
    difference
  2. B.
    impression
  3. C.
    appointment
  4. D.
    decision
C
句意：在美國看醫(yī)生之前需要預約是常規(guī)慣例。make an appointment約定，預約。所以選C。
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