The meeting ___by the time I got there yesterdayA was on B has been on C had begun D hasbegun

问题描述:

The meeting ___by the time I got there yesterday
A was on B has been on C had begun D has
begun

C
by the time I got there yesterday是过去完成时的标志.
had +过去分词 是过去完成时
经常用by/before/when +过去的时间/句子