【题目】Now that the problem ________, appropriate action can be taken, and final success will be seen.
A. is identifiedB. was identified
C. has been identifiedD. had been identified
在线课程【答案】C
【解析】
试题分析：句意：既然问题已经被鉴别，就应该采取合适的行动，也会看到最后的结果。根据语境和句意，这里用现在完成时的被动语态，故选C。