在页式存储管理中，存放在高速缓冲存储器中的部分页表称为 。

--- I’m sorry I ________ make it yesterday. I ________, but I was really busy.

--- That’s fine. I know you are usually busy at this time of year.

A．couldn’t, intended to have come

B．didn’t, intended to have come

C．couldn’t, intended to come

D．didn’t, intended to come