问题补充：
If you a fresh mind for an interview, be sure to have a good sleep the night before it.
A. will have
B. have had
C. are having
D. are to have
答案：
A. will have
B. have had
C. are having
(答案→)D. are to have
解析：考查时态。Be to do实际上表示将来时。If 引导的条件句中，用一般现在时表示将来时。排除A项。B表示在讲来某个时间已经完成的动作。C不符合条件句的用法。
