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

hard

Several advantages—the ability to react strongly with chip components, to avoid interference from other waves, and to be confined within tiny circuits—       acoustic waves as a promising alternative to electrical waves for transmitting data on computer chips; as a result, researchers are invested in developing more acoustic wave-based chips.

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

A

having positioned

B

positioning

C

by positioning

D

have positioned