I ____ Maria for the first time at the Heart-to-Heart Charity Office. A. saw B. was seeing C. was seen D. has seen tại sao câu này là chọn A mà không phải B vậy ạ When we were on a voluntary tour, we ____ to public places to collect rubbish every day. A. were going B. went C. have gone D. had gone tại sao câu này chọn B mà không chọn B vậy ạ

I ____ Maria for the first time at the Heart-to-Heart Charity Office.

A. saw B. was seeing C. was seen D. has seen

=> Vì có dấu hiệu "For the first time", là một hđ đã xảy ra ở QK và cũng kết thúc nên ms chia thì QK

When we were on a voluntary tour, we ____ to public places to collect rubbish every day.

A. were going B. went C. have gone D. had gone

=> Có dấu hiệu "When" mà lại đang ở thì QK, đã kết thúc ở quá khứ nên ta chọn B

Chúc bạn học tốt, hãy vote5*+CTRLHN+Cảm ơn :33