5．Onseeing （see） her mother，she burst into tears．

分析 一看到她母親，她就放聲大哭起來(lái)．

解答 答案：seeing
此處用作介詞On的賓語(yǔ)，所以應(yīng)使用動(dòng)名詞形式，故填seeing．

點(diǎn)評(píng) 本題考查了在介詞之后使用動(dòng)名詞作賓語(yǔ)的用法．

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