问题补充：
He with his parents to Shanghai once a year.
A. go
B. are going
C. goes
D. is going
答案：
A. go
B. are going
(答案→)C. goes
D. is going
解析：句意：他和他的父母每年去一次上海。结合语境可知本句描述的是经常性的动作，主语为he，单数第三人称，with引导伴随主语，故选C。
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