【题目】Most of the doctors in this hospital were born , and they are now.
A.in the 1970; in their fiftiesB.in 1970s; in the fiftieth
C.in the 1970s; in fiftieth D.in the 1970s; in their fifties
在线课程【答案】D
【解析】
考查时间表达和数词。句意： 这家医院的大多数医生都出生于20世纪70年代，现在他们都是50多岁。in the+四位数的整数复数形式，在……世纪……年代，in one's+两位数的整数复数形式，在某人多大岁数时。故选D。