13．Don't leave the water_____while you brush your teeth．（　　）
A．racingB．rushingC．runningD．rolling

分析 刷牙的時候不要讓水一直流．

解答 答案：C
解析：A：賽跑；B：沖；C：跑；流動；D：滾．根據(jù)句意"刷牙的時候不要讓水一直流"及橫線前面的提示可知，本題考查leave sb doing sth"讓某人一直做某事"這一固定短語；其中run表示"水的流動"，另外run還有"褪色"之意（例句：The color has run．顏色褪掉了．）拓展：leave sb to do sth"聽任某人做某事（事情還未發(fā)生）"．

點評 本題考查動詞的辨析，做此類題目時一定要清楚各個選項的含義及用法；再結(jié)合句意及其它要求確定最終答案．

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