补全对话。
Mary:Welcome to my vegetable garden.
John:Wow. What are these?
Mary:
John:Is that a tomato?
Mary:
John:
Mary:No, they are carrots. Do you like carrots?
John:
A. They are potatoes.
B. Yes, I do.
C. It's so big.
D. Yes, it is.
E. Are they green beans?
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