559. Regular ______ of the air-conditioner is needed to make sure the machine is in good condition.
(A) excavation
(B) maintenance
(C) military
(D) garment

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統計： A(5), B(94), C(8), D(1), E(0) #1592769

詳解 (共 1 筆)

#2351039
excavate(v)挖掘
(共 15 字，隱藏中）
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