Each of the lines in the following passage has a mistake. Find and correct it.
A SURPRISE
Mr. Bush was away from his flat all the afternoon. When he returned, he has discovered he did not have his key. He had left whole set of keys in a pocket of the trouser he had wom before going out. He went downstairs to the caretaker's flat and explained exactly which had happened. The caretaker is sympathetic, "I'm sorry. l have no spare key to your flat". He said, "I used to have one. but someone borrowed it once and never returned it for me. But never mind, I have a friend who understand these things. I'll phone him and he'll come. He is a specialist in opening looked doors without keys. I'm sure he'll be able to help you". He did, either. Later, I found out that he was a fame house breaker.
Trả lời câu hỏi dưới đây:
The caretaker is sympathetic, "I'm sorry. l have no spare key to your flat".
=> was