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35. It has recently been proved_________ lasers can be used to perform bloodless, painless surgery.
(A) where
(B) until
(C) while
(D)that

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pretest 高三下 (2017/05/13)
It has recently been ☆☆☆☆☆☆_...


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35. It has recently been proved_________..-阿摩線上測驗