When she _____ (open) the door, she realized she had forgotten her keys.
A. opened
B. had opened
C. has opened
D. was opening

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Sentences and Non SentencesArticles and NounsVerb BEPast Tense & Past Continuous TenseBASIC GRAMMAR - PRONOUNSHow much and how manyGrammar - Present Perfect with already, just, yetModal Auxiliaries and Similar ExpressionsPassive Voice & TensesPresent Perfect and Past TensesOther quiz:
Tenses › ViewWhich one is pronounced differently?
A. visited
B. decided
C. danced
D. wanted
Tenses › View
We ___ a great time at the party last night!
A. has
B. had
C. have
D. having
Perfect Tenses › ViewUse the present perfect tense in a sentence to describe an action that started in the past and is still continuing.
A. I have visited Paris last summer.
B. I have lived in this city for ten years.
C. I have finished my homework yesterday.
D. I lived in this city for ten years.
Reported Speech › View
Maria: “I think I will go out to dinner tonight.”
A. Haru: Maria said (that) she thought she would go out to dinner tonight.
B. Haru: Maria said (that) she thought she willing go out to dinner tonight.
C. Haru: Maria said (that) she thought she will go out to dinner tonight.
D. Haru: Maria said (that) she thought she will be going out to dinner tonight.