In the past, the leaves of coffee plants _____ helpful ...

[ Grammar ]

In the past, the leaves of coffee plants _____ helpful in improving one’s health.

A. were thought to be

B. were thought as

C. are thought to be

D. are thought as

Select your answer:
A B C D E

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Grammar - Present Perfect with for and since Adverb Of Place Modal Verbs of Certainty and Possibility Superlative & Comparative Adverbs Subject and Verbs Agreement Future Tense Verb Verbs & Verb Tenses Passive Sentence Modals Tenses Conjunctions

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