Which sentence uses a present participle form of a verb? A) Joel was singing in the shower all morning long. B) I really enjoy shopping with my friends for bargains. C) Swimming laps is the most relaxing activity in the world. D) Filing papers can give you a paper cut if you aren't careful.

All of the above!

Explanation:

Dictionary definition of "Present Participle" is

the form of a verb, ending in - ing in English, which is used in forming continuous tenses, e. g. in I'm thinking, alone in nonfinite clauses, e. g. in sitting here, I haven't a care in the world, as a noun, e. g. in good thinking, and as an adjective, e. g. in running water.

A) Joel was singing in the shower all morning long.