問題詳情
34. Small sailboats can easily turn over in the water ______ they are not managed carefully.
(A) though
(B) before
(C) until
(D) if
(A) though
(B) before
(C) until
(D) if
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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