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Respostas
Vamos analisar as sentenças: I- "By the time you read this I will have left" - Future Perfect. II- "Had you been waiting long before the taxi arrived?" - Past Perfect Continuous. III- "It has rained a lot this year" - Present Perfect. IV- "The plane had not taken off when I arrived at the airport" - Present Perfect Continuous. Agora, a alternativa correta é a letra C) As alternativas I e IV estão corretas.
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