[ Grammar ]
Acid rain can be caused due to combustion of fossil fuels or erupting volcanoes or rotting vegetation which ____ sulfur dioxide and nitrogen oxides into the atmosphere.
A. release
B. releases
C. is releasing
D. have released
Select your answer:
Principal vs. Principle Relative Pronoun Future Perfect Tense To Infinitive or Bare InfinitiveGrammar, Conditional Sentences, VocabularyComparative and Superlative AdverbsPositive and Negative ConnotationsGrammar ClausesTenses - Auxiliaries
Other quiz:
Past simple - Irregular Verbs › ViewA long time ago, the pirates —————-(find) a treasure.
A. find
B. foughnd
C. found
Grammar › View
What is the simple subject of the sentence?
The dusty book sat on the top shelf.
_
A. The dusty book
B. book
C. sat
D. sat on the top shelf.
How to use : Read the question carefully, then select one of the answers button.