Can you complete this English expression? It means “a difficult problem to solve”.
A hard ……. to crack
a) stone
b) rock
c) metal
d) nut
The answer is below!↓

Answer: d) nut
A hard nut to crack!
Can you complete this English expression? It means “a difficult problem to solve”.
A hard ……. to crack
a) stone
b) rock
c) metal
d) nut
The answer is below!↓
Answer: d) nut
A hard nut to crack!
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