Air pollution levels ___ dramatically since governments worldwide introduced stricter ...

[ Grammar ]

Air pollution levels ___ dramatically since governments worldwide introduced stricter environmental laws.

A. decreased

B. is decreasing

C. decreases

D. have decreased

Select your answer:

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Past Simple Past Simple, Present Perfect Tense First Conditional, Future Time Clauses Figure of Speech Noun and Pronoun Modals Present Forms and Narrative Tenses To Infinitive/Bare Infinitive/Gerunds Past Tense and Past Continuous

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Verb Phrases › View

What is the verb phrase in this sentence?
Hermione would get a stack of books from the library.

A. get a stack

B. get

C. would get

D. from

Grammar › View

___ is bigger, Canada or the United States?
a. What
b. Which
c. How