Looking up from his computer monitor, Jason mopped his brow, exhaled sharply, and picked up his <span>phone.
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From the sentence the complete predicate of the sentence is letter A. Mopped his brow, exhaled sharply, and picked up his phone.
Complete predicate refers to the clause where the predicate of the sentence is there.
<span>The adverb is "immediately". An adverb is a type of word that adds information to the verb in the sentence. The verb is the word that provides the action. So, in this sentence both "told" and "leave" are verbs, because those are actions, things that you DO. "Immediately" is describing the word "leave" and indicating HOW you need to leave.</span>
B) It is a participle functioning as an adjective