[ a, an, the, Zero Article ]
Einstein is known for his theory of ___ relativity.
a. a
b. an
c. the
d. X [Nothing]

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Have as verb and auxiliaryNounsProgressive TenseReported SpeechApologizingGrammar, adverbs of frequency placementAuxiliary and Modal VerbsPast and Present TensesTenses of VerbsPreposition of DirectionOther quiz:
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How are adjectival clauses introduced?
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A. This was
B. was a
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D. was