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Verbal·Standard English Conventions·Boundaries
hard
Paxillus panuoides fungi have a well-documented association with alder        is, symbiotic bonds between fungal hyphae and host tree roots-the organisms can create extensive nutrient exchange networks.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
trees, by forming mycorrhizal relations-that
B
trees by forming mycorrhizal relations, that
C
trees. By forming mycorrhizal relations-that
D
trees by forming mycorrhizal relations. That