" wrong Some native speakers may say this, but the simple past progressive is all you need and is the best answer in my opinion. /quote]
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dastparvardeh"It's a good thing that they had worn their seat belt when the accident occurred." wrong
"It's a good thing that they were wearing their seat belt when the accident occurred." correct
"it's a good thing that they had been wearing their seat belt when the accident occurred."
dastparvardehwhy we can't use "past perfect continuous" form?You can.