阿摩線上測驗
5. Although the policy has undergone several revisions, many of its most serious problems have proved remarkably ______ and continue to resist meaningful reform.
(A) ubiquitous
(B) intractable
(C) peripheral
(D) rudimentary
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統計： A(1), B(3), C(1), D(1), E(0) #3979336
統計： A(1), B(3), C(1), D(1), E(0) #3979336
