問題詳情
19. Helen couldn't remember _______ the letter until her grandfather told her that he had received it.
(A) to send
(B) send
(C) sending
(D) sent
(A) to send
(B) send
(C) sending
(D) sent
參考答案
答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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