The___________of the outbreak of the disease is still unknown. ... | GrammarQuiz.Net

[ Grammar ]

The___________of the outbreak of the disease is still unknown.

A. aim

B. cause

C. motive

D. reason

Select your answer:

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Grammar Clauses Comparison Degree Modal Verbs in First Conditional Grammar and Passive Voice Relative Clauses beginning with Prepositions Gerund/ To Verb/ Verb Verb Tenses and Subject Verb Agreement Modal Possibilities Past Simple Tense Past Perfect

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