回答
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Many companies use famous celebrities for their advertising campaigns.
Many companies use famous celebrities for their advertising campaigns.
多くの企業が有名な芸能人を広告に使っています。
※CMをテレビCMに断定する場合は”TV commercials”など
回答
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Many companies hire famous comedians for commercials.
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Many companies use famous people in their commercials.
上記の例はどちらでも意味を通じます。
CMは「advertising」や「commercial」を意味します。