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A Hard/Tough Nut to Crack

Today’s English idiom is a hard/tough nut to crack. What do you think this idiom refers to?

a) an angry person
b) a difficult person or a difficult problem to solve
c) an intelligent person
d) a secret or a secretive person

Click
here for the answer.
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Image: Grant Cochrane / FreeDigitalPhotos.net








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