问题标题：
【MrsGreenisadoctorof______andherdaughterAnnis_____universitysthdentA.50yearsold;an18-year-oldB.50-year-old;an18yearsoldC.50yearsold;a18-years-oldD.50-years】
问题描述：
MrsGreenisadoctorof______andherdaughterAnnis_____universitysthdent
A.50yearsold;an18-year-oldB.50-year-old;an18yearsold
C.50yearsold;a18-years-oldD.50-years
曹倩回答：
A
50yearsold形容词表示某一类人
an18-year-old
118/ei---/元音开头用an
2、18-year-old相当于一个形容词修饰单位.
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