Topics: Passive Voice & Tenses
The students have discussed the pollution problems since last week
The pollution problems have been discussed (by students) since last week.
A. The pollution problems had been discussed by the students since last week.
B. The pollution problems have been discussed by the students since last week.
C. The pollution problems have been discussed since last week by the students.
D. The pollution problems have being discussed by students since last week.
Select your answer:

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