Multiple choice

I _____ ____ _____ the letter since morning.

  1. has been writing

  2. have been writing

  3. had been write

  4. was been write

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Present perfect continuous 'have been writing' shows an action continuing from past to present. 'Since morning' establishes the starting point. First-person 'I' requires auxiliary 'have'. The action of writing began in the morning and continues now.

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