[ Relative Pronoun ]
The software … maker was unknown was used by many retailers.
- that
- whom
- whose

Random Topics:
To Infinitive/Bare Infinitive/GerundsVerb Tenses and Past ParticiplesGrammar & VocabGerund & ParticipleInfinitives or GerundsComparative - SuperlativeTimeSimple Future - WillConditionalsPresent Perfect or Past Simple TenseOther quiz:
Reported Speech › ViewShe asked me where I _______ from.
A. come
B. coming
C. to come
D. came
Grammar › View
How are adjectival clauses introduced?
A. By coordinating conjunctions
B. By prepositions
C. By subordinating conjunctions
D. By relative pronouns or relative adverbs