The cohesiveness of a family seems to rely on members sharing certain routine practices and events。For a growing share of the American labor force, however, working shifts beyond the normal daylight hours---what we here call “shiftwork”---makes the lives of families difficult.
Existing research shows that both male and female shiftworkers express high levels of stress
and a sense of conflict between the demands of work and family life.But shiftwork couples still maintain a traditional attitude about the meaning of marriage and the individual roles of husband and wife.They expressed a willingness to do“whatever it takes”to approximate their view of a proper marriage,including sacrificing sleep and doing conventional things at unconventional hours. For the majority of couples interviewed---even when wives worked outside their homes a proper marriage is characterized by a very clear division of roles:husbands are “ providers”whose major responsibility is to support the family;wives are “homemakers”who clean,cook,and care for husbands and children.
69.Despite____,shiftwork couples still hoped
to maintain a stable life.
A.traditional beliefs about marriage
B.lack of control over time
C.a very clear division of role
D.the demands of work
答案给的B,control over time在文中哪里可以找到？

...including sacrificing sleep and doing conventional things at unconventional hours.

...包括牺牲睡眠与把平常的事情安排在不平常的时间。