Which sentence is written correctly?
A. The librarian needed his computer to check in the books, so when the power went out, they could not do their job.
B. The librarian needed his computer to check in the books,so when the power went out, he could not do their job.
C. The librarian needed his computer to check in the books, so when the power went out, they could not do his job.
D. The librarian needed his computer to check in the books, so when the power went out, he could not do his job.

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Vocabulary Spelling GrammarNoun PhraseModal and Relative PhrasesModals and ConditionalsComparative AdverbTime PhrasesTenses and Passive VoiceGive, do and makePossesive Pronouns and Modals of AbilityTenses: Present simple, Past Simple, Future SimpleOther quiz:
Vocabulary › ViewThe test is ______ February.
A. in
B. at
C. on
D. over
Subject-Verb Agreement › View
The man with all the birds ______ on my street.
A. lives
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Compound Words and Sentences › ViewIt is most likely going to rain ______ the day, so I suggest bringing an umbrella.
A. through out
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Grammar › View
_____ she was very tired, she helped her brother with his homework.
A. Because
B. whether
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