谁知道

谁知道	shéi zhī dào	God knows... / Who would have imagined...?
谁	shéi	who / also pr. [shui2]
谁知	shéi zhī	who would have thought / unexpectedly
知	zhī	to know / to be aware
知道	zhī dào	to know; to become aware of / also pr. [zhi1dao5]
道	dào	road; path (CL:条,股) / (bound form) way; reason; principle / (bound form) a skill; an art; a specialization / (Daoism) the Way; the Dao / to say (introducing a direct quotation, as in a novel) / (bound form) to express; to extend (polite words) / classifier for long thin things (rivers, cracks etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process / (old) circuit (administrative division)