Topics: Correlative Conjunction
The study aims to investigate ________ the genetic factors ________ the environmental influences.
A. either-or
B. not only-but
C. both-and
D. neither-for
Select your answer:

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Tenses - Irregular VerbsPast form of ModalsTransitionsMust / must notVocabulary Spelling GrammarGRAMMAR - Could / Could notGrammar - Capitalization and Possessive NounsDistinguishing Future TensesSecond and Third ConditionalTenses of Verbs - UsageOther quiz:
Prepositions › ViewThe company president didn’t want to comment _________ the scandal.
A. for
B. on
C. about
Grammar › View
By the end of next year, George _______ English for two years.
A. will have learned
B. will learn
C. has learned
D. would learn
