[ Grammar ]
What is the meaning of “breaktroughs”?
A. work hours that begin on the evening or late at night
B. having to do with drugs used in medicine
C. important discoveries that help to solve problems

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Countable Vs Uncountable NounsHelpful Phrases Irregular Plural NounsSimple Past - Irregular VerbsVocabulary and Sentence StructurePresent Perfect or Past Simple TenseModals - Reported Speech - ConditionalsNouns, Pronouns, Antecedents, and Singular and PluralPrepositions and ArticlesModals and InversionOther quiz:
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