[ Grammar ]
Rob _____ a problem while he _____ the surveillance system.
A. discover / checked
B. discovered / was checking
C. was discovering / checked
Random Topics:
Inversion + Passive VoiceBASIC GRAMMAR - PRONOUNSIf ClausesVerb Tenses and UsagePast and Perfect TensesAdjectives & AdverbsPresent Perfect TenseConditional Sentences and Verb FormInfinitivesPassive Modals in Different TensesOther quiz:
Mixed General Quiz › ViewMuch of what is characteristically Brazilian in music, folklore and cuisine ___ in the Northeastern region of Brazil.
a. originating
b. originated
c. origin
Modals › View
I _____ hear a strange noise. What is it?
A. can
B. could