— I heard that there were a lot of shouts and screams at yesterday’s party. It must have been terrible.

— Oh, no.  ________, I enjoyed every minute.

A．On the contrary

B．In the end

C．As a result

D．On the other hand

某厂有职工1200人，过去每周工作40小时，出勤率为90%，正好满负荷。现在实行每周36小时工作制(每周工作5天)。

如果提高工作效率20%，那么保持大约多少的出勤率即可（）

A．7.5%

B．90%

C．83%

D．49%