题目内容

---Is Tom in the classroom?

---No, he ______ on the playground.


  1. A.
    is drawing picture
  2. B.
    is riding a bike
  3. C.
    is riding the basketball
  4. D.
    is mending a kite
D
A项中picture一词前面加冠词a或应在其后加复数-s; B项中ride的现在分词应是riding; C项中球类名词前不能加冠词.
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