—______ I complete the composition today, sir? —No, you needn't. You may _______ tomorrow morning.
A:Can, hand it in
B:May, hand in it
C:Must, hand it in
D:Need, hand in it
选手
甲
乙
平均数(环)
9.5
方差
0.035
0.015
函数y=1x在点x=4处的导数是( )