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(xué)習(xí)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�；拒絕；D：打開．根據(jù)句意"你學(xué)習(xí)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(xiàng)分析可知，本題答案為B選項(xiàng)；其余選項(xiàng)均不符合題意．

點(diǎn)評(píng) 本題考查動(dòng)詞短語．做此類題目時(shí)一定要熟悉每個(gè)動(dòng)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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