The ancient artifact, once thought to be a simple tool, is now regarded _________ a masterpiece of early engineering.

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writing

Which choice completes the text so that it conforms to the conventions of Standard English?

A

to be

B

as

C

like

D

for

Correct Answer: B

Choice B is the best answer. The verb "regard" is followed by "as" (e.g., "regarded as a hero").

Choice A is incorrect because "regarded to be" is an unidiomatic error. Choice C is incorrect because "regarded like" is incorrect usage. Choice D is incorrect because "regarded for" is not the standard idiom here.