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
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(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。