The new system needs to be in operation for five months ________ it can be updated.

Aas Bwhile

Cbefore Donce

 

C

【解析】C考察狀語從句。本句的before用語肯定句中,強調(diào)主句動作持續(xù)的時間比較長,意為:要多多久.才。故C正確。

 

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