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

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The fungus Tricholoma matsutake, commonly referred to as matsutake, is known to establish ectomycorrhizal bonds with certain pine tree species; in many cases, such symbiotic relationships, wherein fungal hyphae make contact with the pine’s root system, __________ extensive networks, which can be used to transport nutrients between trees.

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

A

formed

B

form

C

to form

D

forming