Factories allow these dangerous substances to pour into the rivers, ... | GrammarQuiz.Net

[ Grammar Clauses ]

Factories allow these dangerous substances to pour into the rivers, ___ their chimneys fill the atmosphere with poisonous fumes.

A. while

B. where

C. although

D. so that

Select your answer:

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Modal Requests Noun Clause Grammar of Conjunctions and Prepotitions Countable & Uncountable Nouns Modal Verbs of Certainty and Possibility Simple Future - Will Future - will / going to / present continuous Present Perfect or Past Simple Tense Past Perfect and Past Perfect Continuous Tense

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