[ Grammar ]
__________ earliest successful AI program was written in 1951 by Christopher Strachey, later director of the Programming Research Group at the University of Oxford.
A. A
B. An
C. The
D. That

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Grammar - Be going toGrammar - Verb Forms-ed/-ing AdjectivesComplex SentencesPresent Tenses and ConnectorsShould and Shouldn'tBasic TensesPast Tense vs Present Perfect TensePronoun Antecedent AgreementState Verbs and Action VerbsOther quiz:
Simple Future Tense › ViewYour parents … happier If you visit your parents at least once a week.
- are
- will be
Grammar › View
I was walking down the street when it _______ (begin) to rain.
A. begins
B. began
C. begun
D. was begining
Grammar › ViewMarcus said he…………………………(try) to find a flat for ages before he finally found one he liked.
A. tried
B. was trying
C. had been trying
D. has been trying
Tenses › View
Tim was tired. He _______ hard all day.
A. has been studying
B. studies
C. studied
D. had been studying
