She has been working hard day and night which of course her pale face.A. accounts forB

问题补充：

She has been working hard day and night, which of course, her pale face.

A. accounts for

B. stands for

C. goes for

D. answers for

答案：

(答案→)A. accounts for

B. stands for

C. goes for

D. answers for

解析：句意：她一直日日夜夜地工作，当然这也就能解释她的脸色苍白的原因了。account for对……做出解释； stand for代表，支持，容忍；go for主张，努力获得；answer for对……负责。根据句意故选A。