Was it on that morning ________ you left for Beijing ______ he discovered our secret?A.that; whereB.which; thatC.when; thatD.that; when
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C解析本题考查强调句型和定语从句。When you left for Beijing是定语从句修饰前面的that morning; you是 句子的主语，谓语动词：left for;宾语：Beijing.句子是完整的，应该选择关系副词。第二空的that与it was 是强调句型的基本结构。