My sister didn’t leave the car key, so I couldn’t pick her up at the airport.
A. If my sister had left the car key, I could pick her up at the airport.
B. If my sister have left the car key, I would have picked her up at the airport.
C. If my sister had left the car key, I would have picked her up at the airport.
D. If my sister left the car key, I would pick her up at the airport.

Random Topics:
Modals - Have to or ShouldPast simple vs Present perfectSuperlative & Comparative AdverbsWill, Be going to, Present ContinuousTypes of Simple SentencesActive and Passive voiceRoot WordPresent Simple PassiveModal and Auxiliary VerbsImperative SentencesOther quiz:
Vocabulary & Grammar › ViewThe word PERSEVERE most nearly means:
A. To scrub clean
B. Easily deceived; too trusting
C. To continue striving in spite of discouragements and difficulties
D. A written message to reference later; a record or note to help remember
Comparison & Modal Verbs in Passive Voice › View
Nothing ________ because it was very foggy and raining heavily.
A. is seen
B. could be seen
C. haven’t been seen
D. wasn’t seen
Grammar › ViewDo you know ___ Chens? They’re a nice family living in ___ United States.
A. the; the
B. the; (nothing)
C. (nothing); the
D. (nothing); (nothing)
Adjective / Noun + to Infinitive › View
Thank you for your kind offer ____ a dinner at your apartment. It was excellent.
A. having
B. to have
C. had
D. have
