Поставить предложения в Past Perfect i couldn't answer the question because... she was hungry because... my mother worried because... they were late because... the boy was pleased because... he arrived at John's the house because...

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I couldn't answer the question because I had not studied enough
She was hungry because she had not eaten all day
My mother worried because I had not arrived home at the usual time
They were late because they had missed their train
The boy was pleased because he had received a good grade on his exam
He arrived at John's house because he had gotten lost on the way.