We should take good care of our eyes ______. ( )(本题0.5分) A、 only when we can see well B、 only when we cannot see perfectly C、 even if we can see well D、 only when we realize how important our eyes are

We should take good care of our eyes ______. ( )(本题0.5分)
A、 only when we can see well
B、 only when we cannot see perfectly
C、 even if we can see well
D、 only when we realize how important our eyes are

出自：华北水利水电大学混凝土结构设计原理

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