[ Grammar ]
The sales of smartphones _______ declined since last year.
A. has
B. have
C. having
D. had

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First ConditionalPast Tense & Present Perfect TenseModals in the Past - Speculation and DeductionSimple Past or Past ContinuousDefinite and Indefinite ArticlesVerb + InfinitiveArticlesPast Tense and NeutralVerbs and PrepositionsCity PlacesOther quiz:
Grammar › ViewIs the verb in all caps in past, present, or future tense? My friend WILL TELL everyone at school tomorrow what we saw.
A. past tense
B. present tense
C. future tense
Grammar and Vocabulary › View
I will call you ___ I arrive at the office.
A. since
B. before
C. after
D. if
Modal Verbs › ViewIf you’re feeling stressed, you __________take a break
A. Should
B. Must
Present Tenses › View
It tastes absolutely delicious.
A. Taste has a stative meaning here.
B. Taste has a dynamic meaning here.
