3．Look!My sisteris washing （洗） her hands．

分析 翻譯：看！我的姐姐正在洗手．

解答 根據(jù)Look!確定句子的時態(tài)是現(xiàn)在進行時；主語my sister是第三人稱單數(shù)，所以系動詞用is 加washing．故答案為：is washing

點評 本題考查詞匯的慣用法．解決本題首先通過標志詞確定句子的時態(tài)是現(xiàn)在進行時；再根據(jù)主語確定be的形式，根據(jù)漢語提示確定動詞的ing形式．

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