I ________ to go to the party,but I was busy.A.have plannedB.was plannedC.had plannedD.plan
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C解析使用过去完成时态的典型句型:(A)一动作早在过去发生的动作之前:①had done+(before/when/by the time)+一般过去时②一般过去时+after/until+had done ③S+had done+by/up to/till+过去点时间 ④(No sooner/Hardly/Scarcely)+had+S+done+(than/before/when)+S+过去时 (B)表示过去未实现的希望或计划,用过去完成时,常用动词有hope,expect,suppose,mean,think,want。(C)在间接引语中,代替直接引语中的一般过去时和现在完成时。(D)叙述历史事实时,只用一般过去时。如:Our teacher told us that Columbus discovered (√)/had discovered(X) America in 1492.(E)由before或after从句已表示出时间先后,可用过去时代替过去完成时。如:After she (had)left the room,the thief came in. We(had)arrived home before it rained. (F)两个过去的动作;用and(then)或but连接,按照动作发生的顺序表达时,两者都用过去时,表示过去的连续动作;如:I bought a hat but lost it./I lost the hat which l had bought.