Sometimes, people are not conscious of the importance of health. Only when they lose health ___

問題詳情

18. Sometimes, people are not conscious of the importance of health. Only when they lose health ______ its importance.
(A) they know
(B) that they know
(C) do they know
(D) they do know

參考答案

答案：C
難度：非常困難0
統計：A(0),B(1),C(0),D(0),E(0)

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