問題詳情

21. Only after the mysterious event _____ understand the importance of keeping in touch with friends.
(A) did he can
(B)he was able to
(C) was he able to
(D) he could

參考答案

答案:C
難度:適中0.45
統計:A(10),B(7),C(18),D(3),E(0)

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