問題詳情

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

參考答案

答案：B
難度：簡單0.871795
統計：A(1),B(34),C(2),D(0),E(0)

用户評論

【用戶】97017017 9701

【年級】小三上

【評論內容】excavate(v)挖掘