Rob _____ a problem while he _____ the surveillance system. ...

[ Grammar ]

Rob _____ a problem while he _____ the surveillance system.

A. discover / checked

B. discovered / was checking

C. was discovering / checked

Select your answer:
A B C D E

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Inversion + Passive Voice BASIC GRAMMAR - PRONOUNS If Clauses Verb Tenses and Usage Past and Perfect Tenses Adjectives & Adverbs Present Perfect Tense Conditional Sentences and Verb Form Infinitives Passive Modals in Different Tenses

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