Nhận biết (M1)

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.

  forming

• B.

  to form

• C.

  having formed

• D.

  form