(Is )your sister ( doing)her homework? (Has )your sister ( d

(Is )your sister ( doing)her homework? (Has )your sister ( d

问题描述:

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最佳答案:

1.(Is )your sister ( doing)her homework? 

   (Has )your sister ( done)her homework?

 (Did )your sister ( do)her homework?

  (Will)your sister ( do)her homework?

2.Let's ( do) our homework now.

   
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