The government has taken more measures to prevent the H1N1 flu from spreading, but it may still be ——青夏教育精英家教网—

摘要： The government has taken more measures to prevent the H1N1 flu from spreading, but it may still be some time it is completely under control. A. since B. after C. unless D. before

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The government has taken more measures to prevent the H1N1 flu from spreading, but it may still be some time ________ it is completely under control．