問題詳情
39 You cannot see the doctor _______ you make an appointment in advance.
(A)if
(B)in case
(C)only
(D)unless
(A)if
(B)in case
(C)only
(D)unless
參考答案
答案：D
難度：簡單0.754173
統計：A(207),B(83),C(66),D(1491),E(0)
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