[ Grammar ]
According to current research, excessive smartphone usage ___________________ associated with poorer sleep quality and has affected many people.
A. has become
B. will become
C. becomes
D. became

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Conjunctions & PrepositionsConditional Sentences Type 0, 1 and 2Reported Speech and Reporting VerbsPast Tense vs Present TenseArticles and PrepositionsGrammar - ConnectorsSubject and Verb AgreementArticles - rulesWh- Questions Present Simple TenseTransitional WordsOther quiz:
Coordinating Conjunctions › ViewShe has a lot of experience, _____ she is not very confident in her abilities.
A. or
B. but
C. and
D. yet
Tenses › View
My cat ________ (not to enjoy) fish
A. doesn’t enjoys
B. doesn’t enjoy
C. doesn’t to enjoy