______ I was surprised at ______ her positive attitude towards life after losing her legs.A.How, isB.That, wasC.What, wereD.What, was
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D解析考查名词性从句。What I was surprised at是主语从句，what引导起该主语从句并在句中做at的宾语。第二空用was,因为表语是不可数名词attitude，同时句子又是过去时。句意：让我感到惊讶的是她在失去腿以后对待生活的积极态度。