x= int(input("输入数字:")) if x>=90: print( 'A') if 80<=x<90: print( 'B') if 70<=x<80: print( 'C') if 60<=x<70: print( 'D') if x<60: print( 'F)' 如果输入89,则输出结果是()
A.
‘A’
B.
'B'
C.
A
D.
B
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【单选题】SMS was originally designed as part of ( ),but is now available on a wide range of networks ,including 3G and 4G networks.