The 40-somethings found themselves in an embarrassing situation rapid changes in all aspects of society.
A. as a consequence of
B. in favor of
C. for the purpose of
D. by means of
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(答案→)A. as a consequence of
B. in favor of
C. for the purpose of
D. by means of
解析：考查短语。A. 因此，作为……的结果B.有利于，支持C. 为了……的目的D. 用，依靠。句意：作为社会各方面都快速发展的形势结果，40多岁的中年人发现他们自己陷入了一个尴尬的境况。故选A。