凡规定记起止时间的现象，当其出现时间不足（）即已终止，则只记开始时间，不记终止时间。
参考答案：1分钟
_____ my two sisters. And _____ my brother. [ ]
A. This is, this is
B. These are, this is
C. These are, these are
D. This is, these are
简述恢复字迹。
