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NotuntilWorldWarII

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問題詳情:

NotuntilWorldWarII

Not until World War II ______ to use new chemical techniques to purify penicillin.

A.they managed                                   B.that they managed

C.did they manage                                 D.they didn’t manage

【回答】

 C

知識點:倒裝與省略

題型:選擇題