Epilepsy ---- to be caused by poor air, which ---- ...

[ Causative Verb ]

Epilepsy —- to be caused by poor air, which —- to be carried by the veins to the brain.

A. Is believed / thought
B. Believes / is thought
C. Was believed / was thought
D. Is believing / is thinking

Select your answer:

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They make these cars in the USA.

A. These cars were made in the USA by them.

B. These cars was made in the USA by them.

C. These cars are made in the USA by them.