问题补充：
They are teachers and don realize
答案：
选AThey are teachers and don realize what it takes to start and run a company.
意思是”他们是老师并且还没有意识到创立和经营一家公司究竟需要什么．”
it takes sb.some time/some money/sth.to do sth.=做...事需要某人花费...(时间/金钱/东西)
======以下答案可供参考======
供参考答案1:
A供参考答案2:
A供参考答案3:
a供参考答案4:
A供参考答案5:
a
