He would have finished his college education, but he ______ to quit and find a job to support his family.
【正确答案】 C
【答案解析】他辍学是真的，此处是陈述事实，而且动作已经发生，所以用一般过去时。has to的过去时是had to，没有过去完成时had had to这种说法，故选C。