◎ 题干
Don't hesitate to ______ us if he doesn't ______ in time.
[      ]
A. turn to; turn off
B. turn to; turn up
C. turn up; turn to
D. turn down; 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“Don't hesitate to ______ us if he doesn't ______ in time.[ ]A. turn to; turn off B. turn to; turn upC. turn up; turn toD. turn down; 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。