[ Grammar ]
However, no one in Europe then was using multiple masts on their ship.
A. Change was to were.
B. Change their to his or her.
C. correct as is

Random Topics:
Present PerfectImperative SentencesModals of DeductionThird ConditionalsAdjectives and ArticlesOpinion / AgreementVerb FormGrammar: wishes and regretsSentence Adverbs & Third ConditionalIndependent and Dependent ClausesOther quiz:
Expressing Obligation and Modals › ViewWe use must/mustn’t to express:
A. obligation or duty, very strong advice, prohibition
B. prohibition
C. necessity
D. lack of necessity
Tenses › View
Convert to past tense: They will finish the project tomorrow.
A. They finished the project yesterday.
B. They finished the project today.
C. They will have finished the project tomorrow.
D. They are finishing the project tomorrow.
