The new system needs to be in operation for five months ________ it can be updated.
A．a(chǎn)sB．while
C．beforeD．once
C
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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