D
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Answer:
a: to learn
Explanation:
Infinitive is the basic form of a verb, without an inflection binding it to a particular subject or tense. The infinitive is often used with 'to' in front of it.
Depending on the sentence content, there are four ways to puncuate a compound sentence with two independent clauses -
Use a semicolon
Use a semicolon and a transition word (however, therefore)
Use a colon
Use a comma and coordinating conjunction (and, but, for)
December is to winter as September is to Fall (or Autumn).
