-- That T-shirt with Yao Ming's picture on it ____ belong to David. He admires him a lot.
-- No, it _____ be his. He hates black color.
A:can; can't
B:may; needn't
C:must; mustn't
D:must, can't
把求n!的程序补充完整.
____ “n=”;n
i=
s=1
____ i<=n
s=s*i
i=i+1
____
PRINT s
END.