—Imy project by the time you come to London—Great. This way you can act as my guide. A.

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A. finish
B. have finished
C. will be finishing
(答案→)D. will have finished
解析：考查时态。By the time后跟过去的时间，主句用过去完成时；后跟将来的时间，主句用将来完成时。by the time you e to London“到你来到伦敦的时候”，表示的是将来的时间，故主句用will have done sth。故选D。