[ Relative Clauses and etc ]
Humans __________ the planet for centuries.
A. have been damaging
B. have damaged
C. has damaged
D. have been damaged

Random Topics:
Conditional TypesCompound Nouns and Compound Adjectives QuestionsComparisionsTense,noun,preposition,quantityClauses and GerundsModals, Phrasal Verbs, Gerunds and InfinitivesClause Markers TOEFL GrammarSimple Future - PassivePresent Simple: affirmative, negative, interrogativeComparison of Adjectives and AdverbsOther quiz:
Grammar › ViewI ________ to send this gift to Peter.
A. has
B. have
Tenses › View
____ the cake be eaten by my brother later?
A. will
B. would
C. do
D. did