摘要：6．A．You're welcome． B．That's right． C．No.thanks． D．No problem．
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－Can you help me with my Maths?
－________．
[ ]
A．You're welcome．
B．That's all right．
C．No problem．
D．Never mind．
—I'm sorry I'm calling you so late．
—_____.
—_____.
A. No problem
B. You're welcome
C. That's okay
D. I'm all right
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B. You're welcome
C. That's okay
D. I'm all right