Q21
EnglishVerbs, Tenses & Agreement
Choose the right option: While I _____ in the library, someone threw a ball through the window.
- a.was sitting
- b.was seated
- c.had been sitting
- d.am sitting
Answer: (A) was sitting
An action in progress in the past that is interrupted by a shorter, completed action takes the past continuous, with the interrupting action in the simple past: 'While I was sitting ..., someone threw ...'. 'Had been sitting' (past perfect continuous) would need a duration such as 'for an hour', 'am sitting' is present tense and breaks the sequence of tenses, and 'was seated' describes a state rather than the ongoing activity. 'While' is the usual signal word for the past continuous.