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.
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The secretary didn’t take the note to the manager.
A. The note wasn’t taken to the manager by the secretary
B. The note didn’t taken to the manager by the secretary
C. The note wasn’t took to the manager by the secretary
D. The note was taken to the manager by the secretary
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