选择题：Mr. Wang and his son, both looking very happy, ______ taking a walk in the park.

题目内容：

Mr. Wang and his son, both looking very happy, ______ taking a walk in the park.

A. are

B. is

C. has

D. have

参考答案：【答案仅供学习，请勿对照自行用药等】

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