Read the sentence.Tension erupted in the room when it was revealed that the villain knew that the spy withholding information.

The sentence describes events in the past, so “erupted,” “was revealed,” and “knew” are consistent. After “the spy,” the sentence needs a verb; “withheld” completes the clause. Choice D, “the villain knew that the spy withheld information,” is grammatical. The other choices leave “withholding” without a helping verb or shift the sentence into inconsistent tenses.

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