Question

Fill in the blank with appropriate form of verb.

I ______ (read) a novel when I heard a knock at the door.

• A. has been reading
• B. had been reading
• C. have been read
• D. have been reading

Answer 1

Answer:

B. had been reading

• The sentence refers to an action (reading a novel) that was happening before another event (hearing a knock at the door) in the past.

• This is an example of the past perfect continuous tense, which is used to describe an ongoing action that was happening prior to another event in the past.

• The structure of the past perfect continuous tense is: had been + verb (ing).