Choose the letter A, B, C, or D to indicate the correct answer to each of the following questions

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VI. Choose the letter A, B, C, or D to indicate the correct answer to each of the following questions.

1. I __________ at school now.
A. am being
B. was being
C. was
D. am

2. I __________ to Ho Chi Minh City several times this year.
A. have been
B. was
C. were
D. had been

3. He __________ here three hours ago.
A. is leaving
B. left
C. has left
D. have left