◎ 题干
If you have any problem, you can            your teacher.
[     ]
A. turn on
B. turn off
C. turn to
D. turn up
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“If you have any problem, you can your teacher. [ ]A. turn on B. turn off C. turn to D. turn up …”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。