阿摩線上測驗
20 The apartment elevator will be closed for scheduled _____ on Friday so technicians can replace worn cables before they cause problems.
(A) maintenance
(B) management
(C) membership
(D) modification
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統計： A(1), B(0), C(0), D(0), E(0) #4002987
統計： A(1), B(0), C(0), D(0), E(0) #4002987
