By the time I finish, I ___ for 10 hours. MCQ with Answer and Explanation

By the time I finish, I ___ for 10 hours.
A. work
B. will work
C. am working
D. will have been working
Answer: Option D
Solution (By JKSSB Mock Tests)
Duration up to future point → Future Perfect Continuous.

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Practice More Tenses Questions

Question #1
By next Friday, I ___ this book.
A. will have read
B. will read
C. have read
D. read

Correct Answer: Option A


Explanation:
Future Perfect with 'by'.

This question belongs to: English Tenses
Question #2
She ___ for the bus when her friend drove by.
A. was waiting
B. has waited
C. waits
D. waited

Correct Answer: Option A


Explanation:
Ongoing action in past.

This question belongs to: English Tenses
Question #3
By next month, she ___ here for five years.
A. will work
B. worked
C. works
D. will have worked

Correct Answer: Option D


Explanation:
Future Perfect with 'by + future time' for action completed before that time.

This question belongs to: English Tenses