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Verbal·Standard English Conventions·Form, Structure, and Sense

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When studying the concrete used to build ancient Roman structures, MIT researcher Admir Masic analyzed small white mineral features, otherwise known as lime clasts, embedded in the concrete.        analysis led Masic to determine the lime clasts, which previous researchers had dismissed as mixing errors, were evidence of an intentional “hot mixing” process that gives the concrete remarkable self-healing properties.

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

A

All

B

These

C

This

D

Those