This is a special difficulty ___________ to that boy.
A: single
B: sole
C: only
D: unique
A: single
B: sole
C: only
D: unique
举一反三
- His talent is quite ______ . A: mere B: unique C: single D: only
- That building is _____ because all the others like it were destroyed. A: only B: sole C: unique D: one
- Each person's fingerprints are _________. A: single B: unique C: only D: usual
- This book is ________ as it is the only one ever signed by the author. A: special B: unique C: are D: unusual
- Each person has his unique fingerprints. A: interesting B: only C: special