18. The sensitivity surrounding the issue will require policy makers to challenge the perception of critics _____ mix all the issues into one and address them with a biased political agenda.
(A) while
(B) which
(C) those
(D) who
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統計: A(2), B(2), C(0), D(2), E(0) #3915419
統計: A(2), B(2), C(0), D(2), E(0) #3915419