A：Good morning, this is Miss Li, secretary to Mr.Smith of ABC Company. ______ B：This is Zhang Hai from Beijing. ______A：I am sorry, ______. May I take a messageA．Can I help you；May I speak to Mr.Smith；please hold on B．May I speak to Mr.Smith；Can I help you；Mr.Smith is unavailable C．Can I help you；May I speak to Mr.Smith；Mr.Smith is unavailable D．May I speak to Mr.Smith；Can I help you；please hold on