what are you thinking of ____(do)空上该填什么?

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whatareyouthinkingof____(do)空上该填什么?whatareyouthinkingof____(do)空上该填什么?whatareyouthinkingof____(do)空上

what are you thinking of ____(do)空上该填什么?
what are you thinking of ____(do)空上该填什么?

what are you thinking of ____(do)空上该填什么?
doing
think of doing

doing