We held a meeting to sum up our experiences _________ we finishe

We held a meeting to sum up our experiences _________ we finished the work.
A、immediately
B、immediate
C、while
D、before
【正确答案】：A
【题目解析】：immediately立刻，一...就....；immediate立即的，直接的；while当...时；before在...之前
句意：工作一结束，我们就开会总结经验。