John with his sister _____ every week.

John with his sister _____ every week.
A.go shopping
B.are going shopping
C.goes shopping
D.is going shopping
我选的是A,

John with his sister _____ every week.
A.go shopping
B.are going shopping
C.goes shopping
D.is going shopping
答案：C
这里真正的主语是John,with是介词,与后面的成分没有关联,所以这里的谓语动词用单数形式.
再问： 我想问，理解为“两个人”呢？ 为神马不能把“John with his sister ”理解为“两个人”呢？
再答： John with his sister 表示：约翰与他妹妹/姐姐一起，这里是介词with，所以真正的主语是John，如果将with改为连词and，就是两个人，谓语动词用复数形式。