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：可联系答.案.网客服索取。
