听力原文:W: John must be over 40 now.M: Yes when Tom left New York ten years ago John wa

听力原文：W: John must be over 40 now.

M: Yes, when Tom left New York ten years ago, John was already 35.

Q: How old is John now？

(18)

A．35.

B．25.

C．45

D．30

请帮忙给出正确答案和分析，谢谢！