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

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Iris Pan 高二下 (2019/12/20)
It has recently been ☆☆☆☆☆☆ _____ ...


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111. It has recently been proved________..-阿摩線上測驗