I ______ have breakfast at 7:00. But ______ it's 7:20. I'm having my breakfast.

A. usually / often

B. often / usually

C. sometimes / often

D. usually / now

对于一类企业，抽查发现一批不合格(一次检验不合格)，即降为二类企业管理。6个月后企业才能提出升为一类的申请。