—Mum, I think I'm _____to go back to school.

—Not really, my dear. You 'd better stay at home for another day or two. [ ]

A.so well

B.so good

C.well enough

D.good enough

根据我国《合同法》的规定，以下合同属于实践性合同的是（）。

A．买卖合同

B．承揽合同

C．保管合同

D．运输合同