1、The researcher is so designed that once ________ nothing can be done to change it

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

 

 

1、D

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科目:高中英語 來源:101網(wǎng)校同步練習(xí) 高二英語 人教社(新課標(biāo)B 2004年初審?fù)ㄟ^) 人教實(shí)驗(yàn)版 題型:014

The researcher is so designed that once ________ nothing can be done to change it.

[  ]

A.begins

B.having begun

C.beginning

D.begun

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