They ___ for an hour before they found the key. MCQ with Answer and Explanation

They ___ for an hour before they found the key.
A. were searching
B. have been searching
C. searched
D. had been searching
Answer: Option D
Solution (By JKSSB Mock Tests)
Duration before another past event → Past Perfect Continuous.

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Practice More Tenses Questions

Question #1
He ___ the project for six months.
A. is working on
B. worked on
C. works on
D. has been working on

Correct Answer: Option D


Explanation:
Duration up to now.

This question belongs to: English Tenses
Question #2
By the time I got home, the children ___.
A. were sleeping
B. slept
C. sleep
D. had slept

Correct Answer: Option D


Explanation:
Past Perfect for action completed before another past event.

This question belongs to: English Tenses
Question #3
She ___ for this company for five years by next month.
A. will work
B. works
C. will have been working
D. has worked

Correct Answer: Option C


Explanation:
Future Perfect Continuous with 'by' and duration.

This question belongs to: English Tenses