In each of the following sentences, a preposition is mis...

#Questão 487372 - Língua Inglesa, Gramática, IBFC, 2012, INEP, Técnico em Informações Educacionais I

In each of the following sentences, a preposition is missing.

As he is an elderly man, he has a difficulty ________ using the computer.

This is a simple method ________ searching suitable solutions.

She was in trouble _________ robbing a car.

The alternative that respectively brings the correct preposition for each one is

of / in / for

about / by / for

in / of / for

of / of / when

in / on / by

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