13．When you have trouble in learning English，you can ________ your English teacher for help．（　�。�
A．turn upB．turn toC．turn downD．turn on

分析 你學習英語要是遇到問題，你可以向你的英語老師求助．

解答 答案：B
解析：A：調(diào)大（音量）；出現(xiàn)；B：求助于；C：調(diào)�。ㄒ袅浚痪芙^；D：打開．根據(jù)句意"你學習英語要是遇到問題，你可以向你的英語老師求助．"及所給選項分析可知，本題答案為B選項；其余選項均不符合題意．

點評 本題考查動詞短語．做此類題目時一定要熟悉每個動詞短語的含義并結(jié)合用法與其在句中的成分來選擇合適的形式．

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