The number of various educational programs is increasing important roles have been recognized by more and more people.
A. whose
B. where
C. which
D. that
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(答案→)A. whose
B. where
C. which
D. that
解析：考查定语从句。先行词是educational programs，代入定从———— important roles have been recognized by more and more people.作定语修饰roles 。所以选A.