a grammar test question
Hi could someone help explain this question.
The anwser is a, but why b is not possible？
I think the answer b can be interpreted as the action of making coffee was in progress and spanning which included the action of going home. That is she was in the progress of making a cup of coffee right at the time when John got home (arrived at home). Is this possible ?
When John got home from work, _____.
a. she made a cup of coffee
b. she was making a cup of coffee
c. she makes a cup of coffee
d. she has made a cup of coffee