阿摩線上測驗
13. The country is experiencing an epidemic of civic ignorance that will irrevocably________ the strength of the nation's democratic institutions.
(A) undertake
(B) undermine
(C) understand
(D) undercharge
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統計： A(11), B(26), C(5), D(13), E(0) #2717392
統計： A(11), B(26), C(5), D(13), E(0) #2717392
