[ Past Simple, Past Continuous, Past Perfect, Past Perfect Continuous ]
The planes _______ for about an hour and they _____ about 300 miles when something happened.
A. had flown / had been travelling
B. flew / were travelling
C. had been flying / had travelled
D. flew / travelled

Random Topics:
Simple and Progressive Verb TensesSimple Future - PassiveSubject, Object, Possessive Pronoun and Possessive AdjectivesRelative Clauses with who and which-ed and -ing AdjectivesEd and Ing EndingsVerb and PrepositionSentence StructureWill and Going toIndefinite and Definite ArticlesOther quiz:
Tenses Usage › ViewEveryone in the meeting _____ the urgency of addressing climate change.
A. understands
B. understand
C. understood
D. is understanding
Subject Verb Agreement › View
She __________ happier than before.
A. seems
B. seem
C. seemed
D. had seemed