单项选择题

A．Twenty minutes.
B．Fifty minutes.
C．Half an hour.
D．Eighty minutes.
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单项选择题
A．It’s my pleasure.B．Thank you.C．No, you don’t need to thank me.D．It’s not necessary.
A．It’s my pleasure.
B．Thank you.
C．No, you don’t need to thank me.
D．It’s not necessary.
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