Although the plan sounded perfect in theory, it proved to be difficult to execute _________ practice.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
on
B
with
C
in
D
by
Correct Answer: C
Choice C is the best answer. The correct idiomatic pair is "in theory" and "in practice."
Choice A is incorrect because "on practice" is not the correct idiom. Choice B is incorrect because "with practice" changes the meaning to "by practicing." Choice D is incorrect because "by practice" is not the correct idiom.