单项选择题
Speaker A: May I speak to Dr. Wang; please
Speaker B :______
A.Hold on a second, please. I'll put him on.
B.Sorry, Mr. Wang is not available fight now.
C.I am not sure because I don' t know what he is doing.
D.Thank you very much for callin
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75()
A.less
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74()
A.tricks
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C.events
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