Some people won’t realize the importance of their health ______ they have lost it.
A．a(chǎn)fterB．whenC．untilD．a(chǎn)s
C
四個選項分別表示在……之后、當(dāng)……時候、直到……時(多和not一起搭配使用)和當(dāng)……時候(強調(diào)兩個動作同時發(fā)生)。根據(jù)題意C選項為最佳答案，直到失去它時，人們才會意識到健康的重要性。
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