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The Blue Book of Grammar and Punctuation
1. For each of the following, choose the correct sentence.
NOTE: This is one of a series of quizzes based on guidelines endorsing that for restrictive (or essential) clauses and which for nonrestrictive (or nonessential) clauses. These principles, first put forward in the 1920s, are widely taught in America by traditional English instructors, but are not necessarily the practice of all writers and editors.
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