问题补充：
It’s time that he has failed in the experiment.However, he has made up his mind to try time next week.
A. the first…a second
B. a first.. the second
C. for the first.. second
D. the first..second
答案：
(答案→)A. the first…a second
B. a first.. the second
C. for the first.. second
D. the first..second
解析：the first time意思是第一次，但a second time表示在原来的基础是再来一次。
