Although he acts tough, A. his bark is worse than his bite B. he’s a tough nut to crack C. he’s learned the hard way D. he isn’t up to scratchĐoạn văn15/97Although he acts tough, ________.his bark is worse than his bitehe’s a tough nut to crackhe’s learned the hard wayhe isn’t up to scratchGiải thíchĐáp án: A