Question

Amin could not open the door because one of the other students--------- it from inside


locked

was locking

has locked

had locked​

Answer 1

Had locked

Hope it helps ☺️

Answer 2

Amin could not open the door because one of the other students had locked it from inside. (Option D)

• The past perfect tense tells us that an occasion happened withinside the beyond earlier than some other occasion happened withinside the beyond.
• The assertion Daniel had departed by the point Erica came, for example, employs the past ideal tense to explicit that Daniel left his house earlier than Erica arrived.
• We use the past perfect simple (had + beyond participle) to talk approximately time as much as a sure factor withinside the beyond.