By the time I got to the office, the meeting .A. had begunB. beganC. was beginningD. would

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(答案→)A. had begun
B. began
C. was beginning
D. would begin
解析：考察时态。本句中的关键词是by到…时为止；该词与完成时连用。本句中by后面接的时间状语是I got to the office这是一个过去时的时间，故使用过去我才是。句意：到外面来的办公室的时候，会议已经开始了。故A正确。