China is playing a key role in controlling the virus. However, it will take long and much effort ________ it is under c

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1. (2020·南京模拟) China is playing a key role in controlling the virus. However, it will take long and much effort ________ it is under control.

A . until B . after C . before D . unless

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备考2021年高考英语一轮复习27：状语从句