Perhaps we __________ our work by the time she arrives here.A. will have finishedB. had finishedC. have finishedD. would have finished

步骤 1：理解句子结构
句子的主句是 "Perhaps we ________ our work"，而从句是 "by the time she arrives here"。从句中的 "arrives" 是一般现在时，表示将来的时间点。
步骤 2：确定主句时态
由于从句表示将来的时间点，主句需要使用将来完成时，表示在将来某个时间点之前已经完成的动作。
步骤 3：选择正确的时态
将来完成时的结构是 "will have + 过去分词"，因此选项 A "will have finished" 是正确的。