— What do you think made Mary so sad?— ________ her car which she spent almost all her savings on．A.As she lostB.LostC.LosingD.Because of losing
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C解析在这句句子中动名词词组做主语回答what的提问，省略了谓语动词。这句句子完整的回答应该是Losing her car which she spent almost all her savings on made Mary so sad．