The warden . . . . . . . . into the room to see what the students . . . . . . . ..

The correct answer is: B. Went/was doing

The warden went into the room to see what the students were doing. The simple past tense is used to describe a completed action in the past. The past progressive tense is used to describe an action that was in progress at a specific time in the past. In this case, the warden went into the room at a specific time in the past (when the students were doing something) to see what

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