is, are, has, have, having The average British family, which __

is, are, has, have, having
The average British family, which ___ smaller and richer than 50 years ago,____ 3.6 members.
【正确答案】：is;has
【题目解析】：【考点点击】本题考查主谓一致。【要点透析】 The average family作为一个整体,谓语动词应用第三人称单数形式,故第一个空填is,第二个空填has