Прочитайте эти вопросы и заполните пробелы, используя глаголы из скобок в прошлом perfect continuous.
1.
he
for three hours? (wait)

2.
your friends
at this university for five years. Was it difficult? (study)

3.
anybody
? I could smell cigarettes. (smoke)

1. Had he been waiting for three hours? (wait)

2. Your friends had been studying at this university for five years. Was it difficult? (study)

3. Had anybody been smoking? I could smell cigarettes. (smoke)