問題詳情
38. Don can’t live without his smartphone because he has to be ___ 24 hours a day.
(A) on call
(B) on duty
(C) in demand
(D) in preparation
(A) on call
(B) on duty
(C) in demand
(D) in preparation
參考答案
答案：A
難度：簡單0.833333
統計：A(20),B(4),C(0),D(0),E(0)
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