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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:
Mixed General Quiz › ViewThe world record for speed skating was ___ many time at the 1998 Nagano Olympics.
a. dropped
b. broken
Grammar › View
Every Friday they _________ at the bar.
A. are drinking
B. drink
C. is drinking
D. drinks
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