Question

complete the sentence.
in 1804, william clark, who was an outdoorsman and ________, joined his friend meriwether lewis on an expedition from st. louis to the coast of oregon.
a skilled mapmaker
skilled at mapmaking

Explanation:

The sentence uses parallel structure to describe William Clark: "an outdoorsman and [noun phrase]". "a skilled mapmaker" is a noun phrase that matches the structure of "an outdoorsman", while "skilled at mapmaking" is a participial phrase that breaks the parallelism.

Answer:

a skilled mapmaker