【单选题】
He the job well，but he so careless.
①
could do，was
②
had done，had been
③
could have done，was
④
hadnˊt done，had been
【单选题】
He was sentenced to death, because he ( ) the murder.
①
contributed
②
committed
③
conducted
④
controverted
【单选题】
Had he worked hard, he _____ the exams.
①
must have got through
②
would have got through
③
would get through
④
could get through
【单选题】
He is so shy that he ____ speaks in the public.
①
often
②
frequently
③
seldom
④
sometimes