Answer:
It is an infinitive phrase used as the object of the preposition on.
Explanation: a Infinitve phrase basically is anything with "to" in it, so To finish the test "on" time seemed and impossible task. The only thing that makes this one seem different is the on thats in the sentence, Hope this helps!
Answer:
D.) It is an infinitive phrase used as the subject of the sentence.
Explanation:
An infinitive phrase can act like nouns, adverbs, or adjectives. If they were to act as a noun, they might act as the subject of the sentence. Such as βTo exercise is the only thing on his mind.β As an adjective, they'll modify a noun. Examples of an infinitive phrase include, "to walk", "to eat", "to read", or "to swim."