She has been working hard day and night, which of course, her pale face.
A. accounts for
B. stands for
C. goes for
D. results from
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(答案→)A. accounts for
B. stands for
C. goes for
D. results from
解析：句意:她日日夜夜的工作这使她的脸色苍白。account for说明……的原因；stand for代表，支持；go for主张，拥护；result from起因于。根据句意故选A。