[ Past Perfect or Past Perfect Continuous ]
After they ________ the door, they saw that awful mess.
A. had opened
B. had been opening
C. had open

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Indefinite and Definite ArticlesPast Simple & Past ContinuousIntermediate GrammarNouns, Pronouns, Antecedents, and Singular and PluralPresent and Past Simple TenseAuxiliary and Modal VerbsQuantifiers and AdjectivesSimple Past Tense (was/were)Linking Words and ConjunctionFamily Vocabulary and GrammarOther quiz:
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A. is
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What does ‘anxious’ mean?
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C. group tours are good, too
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We … to take the rubbish out every evening.
A. should
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