答案： B
题干意思：怀特教授和我约好九点见面，但他还没有出现。
解析：
A.turn in 上交、归还
You must turn in your pass when you leave the building.你离开大楼时必须交还通行证。
B.turn up 1出现、露面 It's a fair bet that they won't turn up.我敢打赌，他们不会出席。
2调大(声音)Bill likes to turn up the TV.比尔喜欢把电视声音开大。
C. turn around 1转向 Bud turned the truck around, and started back for Dalton Pond.
巴德把卡车调了个头，开始返回道尔顿池塘。
2(生意或经济)好转 Turning the company around won't be easy.使公司好转不容易。
D.turn on 打开
Please help me turn on thelight请帮我把灯打开。
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