--I was so sure that our experiment was going to succeed, but something went wrong at the last momen
--I was so sure that our experiment was going to succeed, but something went wrong at the last moment.
--_________, but don't give it up.
A.You don't mean that
B.Find out the reason
C.Never mind
D.I'm sorry to hear that
答案及解析： D
解析：
对他人不幸之事表示难过。