题目内容

Now Mr. Zhou has became ______ expert ______ teaching Chinese.


  1. A.
    an; at
  2. B.
    the; in
  3. C.
    a; of
  4. D.
    /; /
A
expert为元音开头,词前应用an。表示“在汉语教学方面”应用at,所以选A。
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