問題詳情
23. You buy a gift, but you can if you want to.
(A). must
(B). mustn't
(C). have to
(D). don't have to
(A). must
(B). mustn't
(C). have to
(D). don't have to
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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