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1. I __ to the theatre last Saturday.
A. used to go
B. went
C. have gone

2. She couldn't find the keys because she __ them in the office.
A. has left
B. was leaving
C. had left

3. They __ us very often but now they live far away.
A. used to visit
B. have visited
C. had visited

4. I met her in the park. She __ with her dog.
A. had walked
B. walked
C. was walking

5. She didn't recognise her cousin at first. He __ a lot.
A. was changing
B. has changed
C. had changed