单选题：A running process may be switched to release CPU, when one of fo

A running process may be switched to release CPU, when one of following events occurs EXCEPT: @[A](1)
A. The process calls a subroutine
B. The process issues an I/O request
C. The process creates a sub-process and waits for its termination
D. An interrupt occurs





A.The process calls a subroutine
B.The process issues an I/O request
C.The process creates a sub-process and waits for its termination
D.An interrupt occurs


答案：A