A majority of Americans preferred a family of thr
问题描述：
A majority of Americans preferred a family of thr
A majority of Americans preferred a family of three or more children until 1967,but two took hold in the 1970s and ____the top choice ever since.
A.remained.B.was remained C.has remained D.has been remained
答
C
remain是不及物动词,不能用被动态,首先排除B和C,
ever since 意思是从那时至今,表示持续到现在,没有结束,所以要不能用过去时,应用现在完成时,因此只能选C.