"1)The girls of Rainbow *have been preparing to make their return to the music scene and now they’re back! For this comeback they’re **changing up their image. 2)Their company DSP Media disclosed, “They’ve only shown innocent and **** sides.
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aramahosi"have been preparing to" VS "is preparing to"The subject is plural (the girls) so the contrast is not as you portray it. It is "have been preparing to" vs "are preparing to".