The phrase "mostly showed a" is grammatically correct and can be used in written English.
It is typically used to describe something that was mostly or predominantly displayed or demonstrated. Here is an example: "The museum exhibit mostly showed a collection of ancient artifacts, but there were also a few modern pieces on display."
The title of Ms. Palin's book is "Going Rogue," but her appearance on "The Oprah Winfrey Show" mostly showed a politician-celebrity going for broke.
Ms. Chen did not talk to marines on the segment, which mostly showed a tape of her walking across the base in tight white pants and a turquoise T-shirt as if preparing for an invasion of St . Tropez
Images taken during the daytime mostly showed a 'featureless' ocean surface (Fig. 1A).
Untreated dogs mostly showed a progressive disease course [ 94].
In general, studies mostly showed a trend towards positive associations of cadmium exposure and DNA methylation.
While detyr Tub was rarely enriched in swellings (Fig. 5C), acetylated tubulin mostly showed a prominent staining (Fig. 5D).
Most of the sites located in the southern part of the Main Himalayan Thrust subsided, whereas the northern part mostly showed an uplift.
Peña Nieto's standing in polls has been overall low, although surveys released in the week prior to his third anniversary as president mostly showed an uptick.
But Iraqis have mostly shown a willingness to set aside immediate vengeance for the relentless pursuit of justice.
You can find another pair of images, mostly showing a rather tough to read spec list, over at WinRumors.
With its opulent reds, the warm, muted light, the soft piano music, the large-scale paintings that mostly show a scantily clad Josephine Baker, and the large mirrors on the walls, a certain sensuality can be felt at Chez Josephine.
