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Gmat sentence correction #304

Could you please explain why E is wrong? I did not choose C because “their grandparents would have found miraculous” is missing an object (what do the grandparents find miraculous?)

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This is a simple rule we mentioned in the class - in non-restrictive attributive clause we use “which” whereas in restrictive attributive clause we only use “that” to refer to something.

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Also, it does not miss an object, the object is appliances. As it serves as object in the attributive clause and therefore it is omitted.

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