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Scientistsbelievethatitmightbeseveralyears

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問題詳情：

Scientistsbelievethatitmightbeseveralyears

Scientists believe that it might be several years ______ the medicine can be used on human beings．（　　）

A．since     B．when     C．before   D．until

【回答】

C

知識點：連詞

題型：選擇題

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