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【单选题】
当采用单缓冲技术进行磁盘输入时，设从磁盘上读入1块的时间为T，将数据从单缓冲区送入用户区所需时间为t，用户程序处理这块数据的时间为p，且T>t，T>p。如果需从磁盘上读入2块数据，并进行处理，则总共需要花费的时间为(　　　)
A.
．2T+2t+2p
B.
2T+2t+p
C.
2T+t+2p
D.
2T+t+p
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