Were Jack and his sister at the library?
【解析:Jack and his sister是两个人,用复数,and并列】
【拓展:如果and改成with,那么with his sister就是一个插入语,主语是he,这时候才用单数】
【俊狼猎英】
Were Jack and his sister at the library?
【解析:Jack and his sister是两个人,用复数,and并列】
【拓展:如果and改成with,那么with his sister就是一个插入语,主语是he,这时候才用单数】
【俊狼猎英】