题目内容
a trainer
A.someone who talks at a public event
B.someone who helps people to improve at a sport, skill or school subject
C.someone who advises people on a particular subject
D.someone who writes books or articles
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a consultant
A.someone who talks at a public event
B.someone who helps people to improve at a sport, skill or school subject
C.someone who advises people on a particular subject
D.someone who writes books or articles
an author
A.someone who talks at a public event
B.someone who helps people to improve at a sport, skill or school subject
C.someone who advises people on a particular subject
D.someone who writes books or articles
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