19．He found something floating（漂�。� on the lake，which frightened him．

分析 他發(fā)現(xiàn)湖面上漂浮著什么東西，嚇了他一跳．

解答 floating 考查現(xiàn)在分詞．根據(jù)所給的漢語提示"漂浮"和句子結(jié)構(gòu)可知，此處動詞float與其邏輯主語something是主動關(guān)系，且表示動作正在發(fā)生，所以應(yīng)用現(xiàn)在分詞形式做賓補(bǔ)，故填floating．

點評 動詞是中學(xué)英語的重要語法，解題時首先要根據(jù)語境和句子結(jié)構(gòu)的需要來推斷動詞的形式，然后根據(jù)句意和所給的漢語提示選出正確答案．

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