6. The television isn't working. It __ while we were moving house. (A) must be damaged B) needn't have been damaged C) must have been damaged D) should be damaged E) could damage

The correct answer is C) must have been damaged.<br /><br />The sentence suggests that the television was not working while the speaker and others were moving house. The phrase "must have been damaged" indicates that it is highly likely or probable that the television was damaged during the move, based on the evidence provided. This option best fits the context of the sentence.