They would not hesitate _____ the police at the first ...

[ Gerund vs Infinitive ]

They would not hesitate _____ the police at the first sign of trouble.

A. to call

B. calling

C. call

Select your answer:

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Definite and Indefinite Article Modal Verbs and Contrastive Conjunctions Reported Speech Do / Have / Can - Basic Questions Grammar (Adjectives)Conjunctions & Prepositions Pronouns/ Present Tense Modal Verbs of Certainty and Possibility Antonyms

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