Topics: 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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Would/would like - affirmative/negativeActive and Passive voiceUsed to - Would - TensesGerund and To InfinitiveIndependent and Dependent ClausesFew, a few, little, a littleTime PhrasesPresent Simple and Continuous TenseAdverb Types and TensesAdverb of ConcessionOther quiz:
Grammar › ViewSome of the water __________ spilled on the floor. Someone needs to clean it up.
A. has been
B. have been
C. was
D. were
Must / must not › View
You … be rude to your parents
A. must
B. mustn’t
