[ Grammar ]
A theory ——- only when a hypothesis ——- by consistent results from many observations or experiments.
A. may have been developed / was being supported
B. can be developed / has been supported
C. will be developed / was supported
D. has been developed / had been supported
E. had been developed / might have been supported
Random Topics:
Verb Moods and Vague PronounsPresent and Past TenseModals in the PastAdverb Clauses of TimeHomophonesGrammar SuffixesComparativesPossesive Pronouns and Modals of AbilityMain Idea and Sentence StructureAdverbial PhrasesOther quiz:
Articles › ViewI met Sally (на днях)
A. a day before
B. days before
C. the other day
Past Modals › View
You’re all wet! You ____ taken an umbrella.
A. should have
B. might not have
Vocabulary › ViewClick on the word that means the same thing as devour.
A. embarrass
B. devote
C. produce
D. consume
Adverb of Frequency › View
I _____________ watch cartoon because I hate them. News shows are much better.
A. almost always
B. sometimes
C. never