有以下程序：
#include
main()
char a[20],b[20],c[20];
scanf("%s%s",a,b) ;
gets(c) ;
printf("%s%s%s\n",a,b,c) ;
程序运行时从第一列开始输入：
This is a cat!<回车>
则输出结果是( )。
A) Thisisacat!
B) Thisis a
C) Thisis a cat!
D) Thisisa cat!
参考答案：C
解析： 根据scanf和gets函数的功能可知，赋值后，a中的值为“This”，b中的值为“is”，C中的值为“a catl”故本题答案为C) 。
根据短文内容，从下面方框中选择适当的单词或词组填空，使短文内容完整正确。
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