【题目】---What are they doing?
---They are _______ a book.
A. reads B. read C. reading
【答案】C
【解析】根据问句可判断用现在进行时态:be+doing.
上一篇 小数和整数的读法完全一样。(_)...
下一篇 ----When does your mother get up? ( )...
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