David failed in the final examination la

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问题选择题

David failed in the final examination last term and only then________how much time he had wasted

before.[ ]

A. had he realized

B. he had realized

C. did he realize

D. he realized

答案

答案：C

解答题

三位小数大于两位小数．______．

单项选择题

阅读以下程序
#include＜stdio.h＞
main()
Int Case;float printF;
printf("请输入2个数:");
scanf("%d %f",&Case,&printF);
printf("%d%f\n",Case,printF);

以下说法正确的是( )。

A) 定义浯句出错，Case是关键字，不能用作用户自定义标识符，printF不能用作用户自定义标识符
B) 定义语句出错，Int无法被识别
C) 定义语句无错，scanf不能作为输入函数使用
D) 定义语句无错，printf不能输出Case的值