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By ________ time we had just left the office, ________ alarm went off.
A. Ø / the
B. a / an
C. a / the
D. the / an

Random Topics:
Present or Past TensesQuantifierQuantifiers: too many, too much & enoughShould, Should not haveTenses and VoiceModals of Necessity and SuggestionRegular and Irregular VerbsPresent Tenses and ConnectorsPresent Perfect Simple & Present Perfect ContinuousSimple Compound and Complex SentencesOther quiz:
Conditional Sentences and Adverbs › ViewIf I ______ the lecture would hold, I would have attended it
A. know
B. knew
C. known
D. had known
Subjunctives › View
… you visit him, give him my best wishes.
A. Could
B. Would
C. Should
D. Might
Grammar › View. He______ finished cooking when we arrived
A. have
B. had
C. has
Present Continous Tense › View
… is going to the post office
A. Tiara
B. They
C. We