She was educated at Beijing University,_____ she went on to have her advanced study abroad. [ ]

A. after which      

B. from which      

C. from that            

D. after that

执行下列程序后
MOV AL，87
MOV CL，4
HOV AM，AL
AND AL，0FH
OR AL，30H
SHR AH， CL
OR AH，30H
上述程序段运行后，(AX)=______ 。