At the beginning of the twentieth century, most people didn’t accept Albert Einstein’ theory

when it was first _______. [ ]

A. put out

B. put aside

C. put down

D. put forward

很多现代女性既要做好工作，又要兼顾家庭，在时间精力有限的情况下，协调不好就会出现角色冲突。这属于角色间的冲突。