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 Theresearchissodesignedthatonce

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問題詳情:

 Theresearchissodesignedthatonce

 The research is so designed that once _______ nothing can be done to change it.

     A. begins          B. having begun     C. beginning        D. begun

【回答】

D

知識點:一般過去時及其被動式

題型:選擇題

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