WAEC - English Language (2000 - No. 43)
The teachers ............ politics when I entered the staff room.
are discussing
were discussing about
are discussing on
were discussing
Объяснение
The sentence would read:
"The teachers were discussing politics when I entered the staff room."
The correct form is "discussing" without "about" or "on," as "discuss" already means to talk about something. Also, the past continuous tense (were discussing) is used to show that the action of discussing politics was happening when a past action occurred (the action of entering into the staff room).