5.Early detection proved challenging as many patients sought medical attention only after the ___________ period had elapsed, by which time the infection had already progressed to an advanced stage.
(A) incubation
(B) perfusion
(C) remission
(D) suppression
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統計: A(14), B(4), C(7), D(4), E(0) #3427163
統計: A(14), B(4), C(7), D(4), E(0) #3427163