6．David is playing basketball in the playground now．（對畫線部分提問）
Who's playing basketball in the playground now？

分析 David正在操場上打籃球．

解答 答案：Who's 劃線部分David是人，所以要用疑問代詞who提問，后面加上be動詞is，故填Who's．

點評 此題考查疑問代詞，提問人的時候用who，還要注意時態(tài)，本句是現(xiàn)在進行時．

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