SAT Writing and Language Drill 7.8 Conventions of Punctuation

Where does the comma go? Before "which", you always need one. Except in this example. Non-restrictive clauses are almost always set off with commas. Freakin' commas.

Conventions of PunctuationNonrestrictive and parenthetical elements
Product TypeSAT Writing
SATSAT Writing and Language
SAT WritingStandard English Conventions
SAT Writing and LanguageStandard English Conventions
Standard English ConventionsConventions of Punctuation
Test PrepSAT Writing