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:
Conditional Sentence Type 2 and Type 3 › ViewWhich type of conditional is this sentence?
If I were rich, I would travel around the world.
A. type 3
B. type 0
C. type 2
D. type 1
Past Modals › View
“The microwave seems to be working again.” “Maybe Andy fixed it.”
A. Andy might have fixed it.
B. Andy fixed it.
C. Andy must have fixed it.
D. Andy can’t have fixed it.
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.