By the end of the day, I ___ all the emails. MCQ with Answer and Explanation

By the end of the day, I ___ all the emails.

A. answered

B. will have answered

C. will answer

D. have answered

Answer: Option B

Future Perfect with 'by'.

This question belongs to: English Tenses

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Question #1 Report Error

I knew that he ___ a doctor.

A. is

B. will be

C. was

D. has been

Correct Answer: Option C

Explanation:
Sequence of tenses: main clause past, subordinate clause past.

This question belongs to: English Tenses

Question #2 Report Error

I ___ him last week at the conference.

A. was meeting

B. met

C. have met

D. meet

Correct Answer: Option B

Explanation:
Simple Past with 'last week'.

This question belongs to: English Tenses

Question #3 Report Error

I ___ her before she became a star.

A. had met

B. meet

C. have met

D. met

Correct Answer: Option A

Explanation:
Meeting happened earlier than becoming a star → Past Perfect.

This question belongs to: English Tenses