Assuming the underlined word is 'singing,' the correct answer is going to be A. participle.
A participle and a gerund look the same - they both end in -ing. However, participles are used as adjectives (as is the case here), whereas gerunds are used as nouns. Infinitives always have the same form, which is TO + verb.
They built the military up and started becoming allies with Germany
he used his rifle as a club and his knife to do it
It would be <span>Michelangelo Buonarroti mainly because all of the other people were equally contributing in their parts of the renaissance.</span>
Conserving Rubber , taking part in metal drive food drives, buying war bonds, and getting jobs in the war industry. even women got jobs in the war industry they were called 'Rosie the Riveters' because they riveted the sheet metal the the planes
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