题目内容
（请给出正确答案）
[主观题]
Which of the following can you infer from the conversation？A．They were regular customers o
Which of the following can you infer from the conversation？
A．They were regular customers of the shop.
B．Mark had been to the shop before.
C．Shelley had been to the shop before.
D．Mark and Shelley were not very familiar with the shop.
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