物业服务企业一级资质审批前，应当由省、自治区人民政府建设主管部门或者直辖市人民政府房地产主管部门审查，审查期限为（）个工作日。

A.7

B.15

C.2O

D.30

Our teacher punished Tom for his being late for school last month. ______, Tom gets up early every day and is never late again.

A． Now and then

B．From then on

C．Till then

D．Just then