问题
选择题
After a long and tiring flight, Mr. Ritz was frustrated at the news _____ his luggage had been sent to Hong
Kong by mistake. [ ]
A. that
B. which
C. what
D. because
答案
答案：A
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After a long and tiring flight, Mr. Ritz was frustrated at the news _____ his luggage had been sent to Hong
Kong by mistake. [ ]
A. that
B. which
C. what
D. because
答案：A
如果Ai=10，则以“X”表示。从以上算法可知，对18位身份证号Ai（i=1，…，18）进行校验的方法是验证：是否等于（）