下列各项中，不属于投资性房地产确认条件的是（）。

A.投资性房地产，是指为赚取租金或资本增值，或者两者兼有而持有的房地产

B.与该投资性房地产有关的经济利益很可能流入企业

C.该投资性房地产的成本能够可靠地计量

D.投资性房地产属于有形资产

_____ a written permission, he had to write another letter to the president of the university. [ ]

A. Not giving

B. Not having been given

C. Having not given

D. Having not been given