[ Grammar TOEFL ]
A machine _____ could monitor efficiency would be very useful.
A. whom
B. that
C. it
D. when

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Present Tense vs Past TenseTenses and ArticlesPast Simple Negative & QuestionsFuture TensesPrepositions Of PlaceMoods of GrammarIndependent ClausesGrammar - Present Perfect with already, just, yetConjunction: Because and SoModal Auxiliaries and To Be VerbsOther quiz:
Grammar › ViewHe ________ to the park every Sunday.
A. went
B. goes
C. going
Present Perfect Continuous Tense › View
why are you shoes so dirty ? What ….. ? (Do)
A. have not you been doing
B. have you been doing
C. you have been doing
D. were you doing
Tag Questions › ViewShe is collecting stickers, ……………..?
A. is she
B. does she
C. isn’t she
D. doesn’t she
Past or Present Verb Tense › View
Which vocab word matches this definition:
When two or more things rely on each other to work.
A. Systems
B. Interdependent
C. Interrelated
D. Food security