The tenses that can be used to fill up the missing words are: what did he (do) right now.
What is Grammatical tense?
In grammar, a tense is known to be a kind of a category that is often used to show time reference.
Note that Tenses are known also to be shown or manifested by the use of some kinds of forms of verbs, and along with a conjugation patterns.
Note that the main tenses is seen in many languages such as in the past, present, and future.
Therefore, The tenses that can be used to fill up the missing words are: what did he (do) right now.
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