Nobody knows for sure, but it's believed that the balls ...

[ Grammar ]

Nobody knows for sure, but it’s believed that the balls ___ by the ancestors of native people.
A. could have been made
B. could be made
C. could have made
D. could have be made

Select your answer:

Random Topics:

Auxiliary Words Ordering Adjectives Modal and Auxiliary Verbs Pronounciation and Grammar Tenses & Affixes Gerunds TOEFL Adjective and Adverb Comparisions Adverbs, Prefixes, and Suffixes

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