Use past perfect continuous tp complete the sentences. See Reference Grammar 1. Her eyes were red. It was clear she (cry). 2. Mrs Thompson
(wait) for 3 quarters of an hour before the secretary came. 3. Jane
was very tired. She (do) her room since afternoon. 4. Alec said he
(stand) there since 6 o'clock. 5. Jill (study) English for 5 years before
she visited the USA.​

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