问题
单项选择题
Which of the following is used when one fails to catch what the speaker has said ( )
A．Excuse me.
B．I'm sorry.
C．Keep nodding.
D．I beg your pardon.
答案
参考答案：D
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Which of the following is used when one fails to catch what the speaker has said ( )
A．Excuse me.
B．I'm sorry.
C．Keep nodding.
D．I beg your pardon.
参考答案：D