Many mechanical calculators were powered by a notched cylinder mechanism called the Leibniz wheel. Leibniz wheel calculators were popular in the first half of the twentieth _______ these ingenious devices were eventually replaced by electronic calculators. Which choice completes the text so that it conforms to the conventions of Standard English?
Correct answer: C (parsed from the explanation — this source omits an answer key for this item)
Explanation
Choice C is the best answer. The convention being tested is the coordination of main clauses within a sentence. This choice correctly uses a comma and a coordinating conjunction (“but”) to join the first main clause (“Leibniz...century”) and the second main clause (“these ingenious...calculators”). Choice A is incorrect because it results in a run-on sentence. The two main clauses are fused without punctuation and/or a conjunction. Choice B is incorrect because it results in a comma splice. Without a conjunction following it, a comma can’t be used in this way to join two main clauses. Choice D is incorrect because joining the two main clauses in this way with the subordinating conjunction “that” results in an ungrammatical and illogical sentence.
Loading…
Searched on YouTube by topic, not by question text. Open this search on YouTube →
Extracted from PDF layout: equations, figures and tables do not survive intact. Use the original PDFs for anything the text renders poorly. SAT® is a trademark registered by the College Board, which is not affiliated with and does not endorse this project.