[ Tenses ]
They ___ for an hour when it started to rain.
A. walk
B. were walking
C. had walked
D. had been walking

Random Topics:
Simple PastGerunds & Infinitives + VocabularyGrammar and IdiomsModals and ResponsibilitiesPast and Present TensesGiving and Asking for AbilityBe Verb in TensesAdverb ClausesBare Infinitive and To InfinitiveSingular and Plural NounsOther quiz:
Family Vocabulary and Grammar › View. My grandparents ___ in a small town.
A. live
B. lives
C. lived
D. will live
Subject Verb Agreement › View
Something ___ to be done about the increasing rate of crime.
A. need
B. needs