問題詳情
20. Only after he had spoken __________ he had made a big mistake.
(A)he had realized
(B)he realized
(C)could he realize
(D)did he realize
(A)he had realized
(B)he realized
(C)could he realize
(D)did he realize
參考答案
答案：D
難度：適中0.565217
統計：A(1),B(5),C(2),D(13),E(0)
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