Quote Originally Posted by dethuong_x0x View Post
Which of the following sentences uses pronouns correctly?

a)
The firefighters, which arrive immediately, try to put out a fire before it spreads.
b)
The firefighters, who arrive immediately, try to put out a fire before it spreads.
c)
The firefighters, whom arrive immediately, try to put out a fire before it spreads.
d)
The firefighters, who arrive immediately, try to put out a fire before its spread

My answer was b, and it was wrong. I could not understand why my answer was wrong. Was something wrong with the answer auto check?


Thank you!

Tớ cũng chọn b. Vậy thầy giáo nói câu nào đúng ???