People do not know the value of health ________ they lose it.

[  ]

A.till
B.when
C.while
D.because
答案:A
解析:

思路分析:持續(xù)性動詞的否定式和till/until連用表示動作的開始.這句的意思是“人們直到失去健康的時候才知道健康的可貴”.


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