In an ancient civilizations people used ... danger with smoke ...

[ Gerund vs Infinitive ]

In an ancient civilizations people used … danger with smoke

A. signal

B. to signal

Select your answer:
A B C D E

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A/An Second and Third Conditional Grammar - Verb Forms Conjunctive Adverbs and Punctuation Would/would like - affirmative/negative Prepositions after Verbs and Adjective Gerunds and Infitinitives Pre-intermediate Preposition (at,in,on)Passive Voice Active Voice

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