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单项选择题

Speaker A: Hello, may I speak to Alan Bright? Speaker B: ______
A.Hello, may I ask who you are?
B.Hello, please wait for a moment and I'll go to call him.
C.Speaking.
D.Hello, I'm Alan Bright.

A.Hello,
B.Hello,
C.
C.Speaking.
D.Hello,
D.
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