If you have Manhattan SC guide, it explains it well.
'Which' - used to introduce non essential modifiers. Means that a modifier introduced by 'which' can be removed without loosing any essential meaning.
'that' - used to introduce essential modifiers.
Read up the Modifiers section in the SC guide for examples and explanations.
Which and That
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Source: Beat The GMAT — Sentence Correction |
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Danielle
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Auzbee's right on target, although the particulars on which/that are very involved. It's important you find a source (manhattan SC works really well) that goes over this in detail and offers practice exercises because the GMAT tests this knowledge over and over.
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