Question

( )He with his parents often ______ dinner at home.选择题

A. have B.has C.to have D.having

Answer 1

选B.has
先分析句子成分
with his parents作he的伴随状语,可拿掉。原句变为He often has dinner at home.句子主旨意思不变
也可以把状语放在后面，则为 He often has dinner at home with his parents.
可以看出来，决定动词是不是第三人称单数的是主语He，而不是状语，不要被误导了啊

Answer 2

B.has，这里主语是he，

Answer 3

A have,有三个人物，often经常