【单选题】A fool, especially if he has the misfortune of knowing anything, should______it as well as he can.
- (A) conceal
 - (B) invalidate
 - (C) protect
 - (D) inspect
 - (E) improve
 
【单选题】A fool, especially if he has the misfortune of knowing anything, should______it as well as he can.
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