問題詳情
40. Don’t buy anything ________ you really need it.
(A)while
(B)once
(C)unless
(D)if
(A)while
(B)once
(C)unless
(D)if
參考答案
答案：C
難度：非常簡單0.913987
統計：A(20),B(6),C(1137),D(81),E(0)
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