問題詳情
27.We have our office_by a cleaning service once a month.
(A) clean
(B) cleaned
(C) cleaning
(D) is cleaned
(A) clean
(B) cleaned
(C) cleaning
(D) is cleaned
參考答案
答案：B
難度：非常困難0
統計：A(1),B(0),C(0),D(2),E(0)
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