阿摩線上測驗
653. The gym is closed on Monday for routine ____ work. The facilities are kept in good condition by the regular checking and repairing.
(A) disturbance
(B) eloquence
(C) maintenance
(D) alliance
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統計： A(15), B(5), C(151), D(6), E(0) #1592863
統計： A(15), B(5), C(151), D(6), E(0) #1592863
