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

题目简介

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

题目详情

The new system needs to be in operation for five months ________ it can be updated.
A.asB.while
C.beforeD.once
题型:单选题难度:中档来源:不详

答案

C
C考察状语从句。本句的before用语肯定句中,强调主句动作持续的时间比较长,意为:要多多久….才。故C正确。

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