When a soil is classified using the International Union of Soil Sciences’ system, its similarity to each of the 32 soil reference groups—defined by several criteria—__________ evaluated, one group at a time, until a match is found. The comparisons are made in a specific order; thus, the criteria for lixisols (soils with clay-rich subsoil) are only applied if the soil doesn’t match the criteria for ferralsols.
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Verbal·Standard English Conventions·Form, Structure, and Sense
mediumWhich choice completes the text so that it conforms to the conventions of Standard English?
A
have been
B
are
C
is
D
was