Question

Complete the text with the past continuous form of the verbs in brackets.Then answer the question.
It(1)was raining(rain)when the art thief took another painting.When Sherlock Holmes arrived at the museum,the museum director
(2)...............(explain)everything to the police.Holmes asked several workers:What were you doing at 4.00pm?The museum guard answered:
I(3)..........(have)a cup of tea in my office.The woman in the ticket office said:I was with my friend.We
(4)............(walk)around the museum.Her friend replied:We
(5)...........(talk)about the weather.The museum director said:
I(6)..........(sit)outside in the museum garden.Dr Watson
(7)...........(listen)to these interviews.Sherlock Holmes suddenly looked up and said:It was the director!How did he know?
Odpowiedzcie tylko na to pytanie : How did he know, bez rozwiązywania zadania.