1. We waited until the plane -

[রাজশাহী বিশ্ববিদ্যালয় ইউনিট: D সেট: ০১ (বাণিজ্য) ২০১১-২০১২ : 2012]

1. did not take off

1

2. had not taken off

2

3. took off

3

4. had taken off

4
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