He( )the job well, but he ( )so careless. ( )
A.hadn't done, had been B.could have done, was C.could do, was D.had done, had been正确答案C
He( )the job well, but he ( )so careless. ( )
A.hadn't done, had been B.could have done, was C.could do, was D.had done, had been正确答案C