[ Grammar ]
It was clear that a chemical factory had __________the pollution in the local rivers.
A. caused
B. had
C. made

Random Topics:
Adjective and AdverbModals AuxiliaryAdjective Clause and Adverb ClauseV-ing/to-VParts of Speech and Compound SentencesTenses and Time MarkersFirst ConditionalVerb, Object, PrepositionGrammar AssessmentComparatives, Superlatives & EquativesOther quiz:
Relative Pronouns and Adverbs › ViewTo _______ are you speaking?
A. who’s
B. whose
C. whom
D. who
Vocabulary › View
The exam preparation gives me alot of ____________.
A. accolades
B. angst
Grammar › ViewI’m doing my project tonight, so I _____ go out with you.
A. can’t
B. am not
C. can not
D. don’t
Simple Past Tense › View
When the lights …… off, we …… our favorite series.
A. went …… were watching
B. were going …… were watching
C. went …… watched
D. were going …… watched
E. gone …… watched
