问题
单项选择题
______ are used to address others to draw their attention. ( )
A．Responses
B．Vocatives
C．Farewells
D．Introductions
答案
参考答案：B
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______ are used to address others to draw their attention. ( )
A．Responses
B．Vocatives
C．Farewells
D．Introductions
参考答案：B