Complete the following sentences using past perfect, past Continuous or past perfect continuous. 1. They waited until we were all there before they had started / started. 2. I was sure that I saw / had seen her somewhere before. 3. He had left / left school by the age of sixteen. 4. I had gone to sleep / went to sleep by the time he arrived. 5. He couldn’t write because he injured / had injured his hand

1. had started

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