New research on technology and public policy focuses on how seemingly ____
design features, generally overlooked in most analyses of public works
projects or industrial machinery, actually ___ social choices of profound
significance.
(A) insignificant...mask
(B) inexpensive...produce
(C) innovative...represent
(D) ingenious...permit
(E) inopportune...hasten
我选C，不过正解是A，看不太懂这句子的结构，有请高手帮忙解惑，谢谢!