— What was it that caused the party to be put off?— ______the invitations.A.Because Tom delayed sendingB.Tom delayed to sendC.That Tom delayed sendingD.Tom delaying sending
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C解析考查句子的省略形式，根据句子结构可知，该句为主语从句的省略形式。完整为That Tom delayed sending the invitations caused the party to be put off.